- Sea Monsters (TV series)
Genre Documentary Created by Tim Haines Directed by Jasper James Presented by Nigel Marven Narrated by Karen Hayley Composer(s) Ben Bartlett Country of origin United Kingdom Language(s) English No. of episodes 3 Production Executive producer(s) Adam Kemp
Producer(s) Jasper James Running time 90 minutes Broadcast Original channel BBC, Discovery Channel, ProSieben Chronology Related shows Other shows in the Walking with... series External links Website
Sea Monsters was a BBC television trilogy which used computer-generated imagery to show past life in Earth's seas. It was made by Impossible Pictures, the creators of Walking with Dinosaurs, Walking with Beasts and Walking with Monsters. In the series, the British wildlife presenter Nigel Marven is shown travelling to seven past seas in the history of the Earth and scuba diving there, in order of dangerousness with the most dangerous last. He travels in a white sailboat or motorboat roughly 24 m (80 ft) long named 'The Ancient Mariner'. His time-travelling device is not mentioned or shown, and the closest thing to it is his time map, showing the timeline of the seven deadliest seas and the creatures that lived at the time. He uses a scuba set with a fullface mask so he can talk underwater to produce the commentary. He performs some dives using a strong shark cage, which is spherical to make it harder for large sea creatures to bite it.
- 1 Episodes
- 1.1 Episode One
- 1.2 Episode Two: "Into the Jaws of Death"
- 1.3 Episode Three: "To Hell... And Back?"
- 2 Animals of the Timeline
- 3 DVD
- 4 See also
- 450 million years ago - Late Ordovician
- 360 million years ago - Late Devonian
- 230 million years ago - Middle Triassic
- 155 million years ago - Late Jurassic
- 75 million years ago - Late Cretaceous
- 36 million years ago - Late Eocene
- 4 million years ago - Early Pliocene
The Seventh Most Dangerous Sea of All Time
- Name: The Ordovician
- When: 450 Million Years Ago
- Hazards: Giant Orthocones, Sea Scorpions
- Cameroceras (Identified as a Giant Orthocone)
- Megalograptus (Identified as a Sea Scorpion)
- Astraspis (Identified as an Armor-plated Fish)
- Isotelus (Identified as a Trilobite)
In the Ordovician, the day is only 21 hours long and there is more carbon dioxide than in the 21st century, forcing Nigel to don a medical-looking backpack filled with air tanks with a special oxygen mixture. To attract a Megalograptus, Nigel finds the corpse of a dead armor-plated fish washed up on the beach. Because there is no land life, there are no coastal scavengers to eat what the sea spits out. Before long, Nigel wades into shallow water and the armor-plated fish attracts a large Megalograptus. The creature devours the armor-plated fish, before attacking Nigel's foot, cutting it badly.
Later on, Nigel attempts to go after a Cameroceras by removing the eye of a dead trilobite and replacing it with a small video camera. He then uses the inflatable raft to venture out into the deeper waters, where he throws the trilobite video camera combo overboard. However, a Megalograptus is quickly attracted to it, and Nigel immediately gets it off of the trilobite. Later in the afternoon, a Cameroceras grabs and eats the trilobite, and Nigel and the cameraman plunge overboard to film it. On the dive, Nigel wears a chain mail suit, so that any marauding sea scorpion cannot harm him. He finds the Cameroceras in which he watches it devour two Megalograptus. The Cameroceras is more agile in the sea than Nigel, and as it attempts to swim away, Nigel grabs onto its shell. When the Cameroceras starts to dive down into the depths, Nigel swims away to the surface, almost getting attacked by another Megalograptus. When Nigel pilots the boat back to shore, he finds a surprise: there are large numbers of Megalograptus mating in the shallow waters. Nigel manages to make his way safely through the Megalograptus hoardes, but a few clamber onto the inflatable boat and puncture it.
The Sixth Most Deadly Sea of All Time
- Name: The Triassic
- Time: 230 Million Years Ago
- Hazards: Nothosaurs, Cymbospondylus
- Peteinosaurus (Identified as a Pterosaur)
- Unidentified Coelurosaur
- Nothosaurus (Identified as a Nothosaur)
- Prestosuchus (in book)
- Neuticosaurus (in book)
- Mastodonsaurus (in book)
As Nigel walks along the tropical coastlines of Triassic Switzerland, he explains that the reptiles are taking over the surface of the earth from the skies (e.g. Peteinosaurus), to the land (e.g. Coelophysis). But of course, he is here to see the earliest sea reptiles.
From the deck of the Ancient Mariner, Nigel and crew watch as a Nothosaurus comes up for air. When he sees one, Nigel dives into the seas, pursuing the elusive sea reptile.
Before long, Nigel finds a pair of Nothosaurus. The Nothosaurus circle him, and Nigel has his prod ready to put off any Nothosaurus that comes too close. One of the Nothosaurus move in closer, so Nigel grabs it around its head to swim with it, and he explains that he would be able to open and close its jaws with tremendous force, but the Nothosaurus' jaw muscles are very weak. Therefore he can ride with it without the Nothosaurus struggling . He lets the Nothosaurus go so that it can breathe air, and Nigel discovers another bizarre sea reptile: a Tanystropheus.
Nigel follows the Tanystropheus, and attempts to get a closer look at it by grabbing onto its tail, impeding its movement. However, the Tanystropheus loses its tail, similar to the modern day leopard gecko. Nigel can hold onto the tail only with difficulty, because it is thrashing around (intended as a predator deterrent). Suddenly the tail is snatched up and then eaten by a Cymbospondylus.
The Cymbospondylus begins to circle Nigel with glee, and he explains that its slow movement is designed to deceive prey, and it can move very quickly when it is needed to. After he pokes it with the prod several times, the Cymbospondylus swims away, and Nigel returns to the relative safety of the Ancient Mariner.
The Fifth Most Dangerous Sea of All Time
- Name: The Devonian
- Time: 360 Million Years Ago
- Hazards: Dunkleosteus
- Bothriolepis (Identified as a Placoderm)
- Stethacanthus (Identified informally as an "Ironing Board" Shark)
- Onychodus (in book)
- Cladoselache (in book)
- Cheirolepis (in book)
- Graptolite (in book)
On a preliminary dive, another crew member of the Mariner (Mike) films a huge female Dunkleosteus, swimming around the shallow reefs near the Ancient Mariner. The crew springs into action, and Nigel goes fishing for Bothriolepis. Nigel places a bet with one of the other crew members that the Dunkleosteus will be able to slice through the Bothriolepis wrapped in the chain mail suit he used in the Ordovician. When the round shark cage is fully assembled, Nigel descends into it. The smell of the dead Bothriolepis begins to attract a young Stethacanthus. Eventually, the monstrous Dunkleosteus is sighted, which scares away the Stethacanthus, and the enraged fish repeatedly bashes the cage with its thick head, and looks as though it's about to rip a hole in the cage...
Episode Two: "Into the Jaws of Death"
...However, the enraged fish only slightly dents the cage.
Eventually, Nigel throws the Bothriolepis out of the cage, and the Dunkleosteus slices through the chainmail and the Bothriolepis. Spying a young Dunkleosteus, the huge adult turns cannibal and kills the baby. She then regurgitates the indigestible parts of its meal (the armor plating and the chainmail).
As Nigel departs for the surface, he explains that the placoderms as a whole have a grim future ahead of them. In another twenty million years, the entire Class of Placoderms will disappear, much to the other Devonian fish's relief.
The Fourth Most Dangerous Sea of All Time
- Name: The Eocene
- Time: 36 Million Years Ago
- Hazards: Basilosaurus
- Sarkastodon (in book)
- Embolotherium (in book)
- Gigantophis (in book)
- Palaeomastodon (in book)
- Physogaleus (in book)
While walking in the mangrove swamps of Giza, Nigel comes across some mysterious footprints and a mound of fresh dung, by smelling the manure, he proves that the owner is a fruit-eater. Following the tracks, Nigel comes across an Arsinoitherium migrating overland. Nigel takes a calculated risk and offers the huge fruit-eater an apple, but apparently this upsets the Arsinotherium and it charges at Nigel. Only by making a break into the thicker forests does Nigel escape from the mammal. Nigel watches from the forest as the Arsinotherium plunges into the water, and follows it. In the water, Nigel watches as a trio of Dorudon, a species of ancient whale, pass by, and he explains that whales are the reason he came: not for the Dorudon, but a far bigger and meaner whale, Basilosaurus.
The Ancient Mariner sails offshore, where the crew try a tactic to attract whales that has been used with mixed success: record a Basilosaurus call and play it back via a huge speaker that is lowered from the boat. After playing it for a while, an enraged Basilosaurus rams into the boat before diving again. Wasting no time, Nigel suits up and dives. However, the whale could attack from any direction, so Nigel stays close to the hull of the Mariner, using the boat like a shield to ward off the Basilosaurus. The Basilosaurus is evidently distressed by the calls, and attacks and disables the speaker (which is explained as a territorial response).
As the Ancient Mariner sails off forward through time, Nigel explains that the tropical Eocene is a world on the brink of great climatic change. As the Oligocene dawns, Basilosaurus, Arsinotherium and Dorudon will all vanish, victims of the climatic shifts that ended the Eocene, changing the warm sea into a cold ocean.
The Third Most Dangerous Sea of All Time
- Name: The Pliocene
- Time: 4 Million Years Ago
- Hazards: Megalodon
- Cetotherium (Identified as a whale)
- Thalassocnus (in book)
- Thylacosmilus (in book)
After several minutes of heated debate, the crew of the Mariner come to an agreement. Before diving in offshore waters with the adult Megalodon, Nigel will dive in the coastal waters, with the juveniles.
Before very long, Nigel finds an Odobenocetops foraging for oysters in the mud, and it is being hunted by an adolescent Megalodon shark. Only by taking cover in the thick underwater foliage does Nigel and the Odobenocetops manage to escape the huge shark.
On the next dive (with the adults), Nigel uses the round shark cage that he previously used in the Devonian era against Dunkleosteus. This time, Nigel hopes to fire a small video camera into the dorsal fin of the shark from the relative safety of the cage. Eventually, a Megalodon is spotted, and Nigel quickly gets into the cage, while the crew sets up bait (a bag of chum), which quickly attracts the shark. As it attempted to attack the cage, Nigel tries to fire the camera.
However, Nigel panics, and never fires it. Later, he tries again, this time from the surface of the Mariner, as the dorsal fin of the Megalodon was much too high to aim at. The shark is drawn again to the boat via liberal amounts of chum. The shark tries to grab the chum but Nigel is nowhere to be seen.
Episode Three: "To Hell... And Back?"
Nigel has been knocked off the boat by the shark and when he swims back, he finally managed to land a hit with the shark-camera, and the Megalodon grabs and swallows the chum. In a few days, they find the camera floating in the sea, and when they load it into the on-board television, they watch the Megalodon in question attack a whale (Cetotherium) the same size as it was.
When the crew of the Ancient Mariner head backwards in time, Nigel says that as the Ice Age begins, the whales that Megalodon preyed on migrated to colder waters, where Megalodon could not follow. Megalodon is doomed to extinction, by hunger.
The Second Most Dangerous Sea Ever
- Name: The Jurassic
- Time: 155 Million Years Ago
- Hazards: Liopleurodon
- Cryptoclidus (in book)
- Ophthalmosaurus (in book)
- Eustreptospondylus (in book)
Set around England, which was then largely underwater. This is the second most dangerous sea. Hazards include Liopleurodon, the largest carnivorous animal of all time. Nigel spies a school of migrating Leedsichthys. One weaker one is lagging behind the school, and a native Metriorhynchus and a foreign Hybodus shark launch a joint attack. Using sonar, Nigel discovers that a huge Liopleurodon is heading toward the injured and dying Leedsichthys. The camera spots it circling the Leedsichthys which is already dead, though the Liopleurodon is eventually spooked away by the camera.
Nigel equips his and the cameraman's diving suit with a chemical system that will spray a cloud of deterrent at the huge pliosaur should they get too close. The crew use huge waterproof lights when they descend to the corpse of the Leedsichthys, because it is night. A pair of Liopleurodon are feasting on the carcass, and Nigel starts to move closer toward them. When one turns its head towards him, Nigel panics and ejects the chemical, which works on the huge predator.
The Most Dangerous Sea Ever
- Name: The Cretaceous/"Hell's Aquarium"
- Time: 75 Million Years Ago
- Hazards: Xiphactinus, Sharks, Giant Mosasaurs
- Squalicorax (Identified as a shark)
- Halisaurus (Identified as a Mosasaur)
- Tylosaurus (Identified as a Giant Mosasaur)
- Unidentified hadrosaur (in book)
- Ankylosaurus (in book)
- Dromaeosaurus (in book)
- Anatotitan (in book)
- Didelphodon (in book)
- Hainosaurus (in book)
- Giant Squid (in book)
Nigel is now entering his final sea mission in "Hell's Aquarium" as he calls it. On the land there's T. Rex, but even the most famous land predator of time all can't compare to what's in the water. After viewing a colony of Hesperornis on the coastline, Nigel and another member of the Mariner pause for a second to view a huge underwater bloodbath. As far as Nigel (using a periscope) can figure out, an elderly Hesperornis was killed, and the resulting carnage has attracted many sea animals, such as Squalicorax, and Xiphactinus. However, Nigel noticed another predator around: a mosasaur known as Halisaurus. Nigel had previously read about mosasaurs, and after spotting some of the smaller species, he and the crew headed out to deeper water in search of Tylosaurus. But Nigel explains that this sea is far too dangerous to go diving in; mosasaurs and other huge carnivores like Xiphactinus are far too dangerous. Instead, the crew of the Ancient Mariner have rigged an ROV to dive for them, while the sonar and cameras on the side of the boat would give them early warning if any mosasaurs are nearby.
The next morning, Nigel discovers that they have hit a dead Archelon, which was mauled by some other predator before being hit by the boat. Later, after managing to domesticate a Pteranodon, the sonar picks up some creatures right beneath the boat. This was a good time for them to use the ROV, and when they send it down, the crew finds that it's a small pod of Elasmosaurus riding their wake like 21st century dolphins. Some of them knocked the ROV when they were investigating it, and an Archelon is also spotted. Having done the same thing with present-day leatherback turtles, Nigel forgoes his personal safety to track down the Archelon and ride it. He and the cameraman ride off in the small inflatable raft that they had used previously in the Ordovician.
Before long, Nigel finds the Archelon when it comes up to the surface for air. He dives, grabbing onto the huge turtle's shell. But not long after, the sonar picked up something nearby: a Xiphactinus was circling Nigel and the Archelon. He quickly makes his escape back up to the raft, but disaster strikes. A family pod of Tylosaurus attack and completely overturn the raft, plunging the crew into the sea. Fortunately for Nigel, the Tylosaurus seem more interested in the boat than the humans, and they quickly escape back to the Mariner.
During the credits, night falls and the crew is fast asleep while the sonar onboard picks up a colossal mob of adult Tylosaurus moving in from all sides, preparing to attack the ship....it is unknown whether they survive or get eaten by the mosasaurs.
Animals of the Timeline
- Woolly Mammoth
Sea Monsters has never been released on DVD in the UK, but featured on the American Chased By Dinosaurs DVD and a similar Dutch DVD (which is Region 2 and plays on UK DVD players).
Sea Monsters is part of a series of BBC documentaries that also include:
- Walking with Dinosaurs (1999)
- Walking with Beasts (2001), depicting life after the dinosaurs
- Walking with Cavemen (2003)
- Walking with Monsters (2005), depicting life before the dinosaurs
The following are Walking With... series specials:
The following are similar programs, produced by the BBC:
- "Prehistoric America (film)" (2003)
- "Monsters We Met" (2004)
Walking with... Television series Television specials Series spin-offs Related shows Creatures Impossible Pictures ProductionsWalking with Dinosaurs (1999) · The Ballad of Big Al (2001) · Walking with Beasts (2001) · The Lost World (2001) · Chased by Dinosaurs (2002) · Sea Monsters (2003) · The Legend of the Tamworth Two (2003) · Space Odyssey: Voyage To The Planets (2004) · Walking with Monsters (2005) · Perfect Disaster (2006) · Ocean Odyssey (2006) · Prehistoric Park (2006) · Frankenstein (2007) · Primeval (2007–2011) March of the Dinosaurs (2011) · Primeval: New World (upcoming)
- 1 Episodes
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