Best movies like Oceanus: Act One

A chance discovery leads American mining engineer Ben Harris and acquaintance Harold to discover a lost city under the sea while searching for their kidnapped friend Jill. Held captive in the underwater city by the tyrannical Captain (Vincent Price), and his crew of former smugglers, the three plot to escape...

Grimes, an amoral chimney sweep, occasionally likes to steal valuables from his clients. One day, on the verge of being caught, he frames his young apprentice, Tom, for the crime. Tom runs away and jumps into a river where, instead of drowning, he finds himself transformed into a mystical aquatic creature. Swimming and breathing effortlessly, he discovers a colorful underwater world replete with creatures both cruel and kind.

Based on the amazing true story of a marine biologist (Robert Lansing) who befriends a six-ton Orcawhale, this "honest, fascinating and vigorously wholesome film" (Citizen-News) is heartwarming fun for the whole family. Like all close pals, Hank (Lansing) and Namu love spending time together. Whether sharing a morning swim or soaking up the afternoon sun, these two are virtually inseparable. Trouble is, the local fishermen mistakenly think that Namu is a threat. Racing against time, Hank must enlist the help of a young widow and her daughter to save Namu and prove that he's a gentle giant!

After witnessing the killing of his mate and offspring at the hands of a reckless Irish captain, a vengeful killer whale rampages through the fisherman's Newfoundland harbor. Under pressure from the villagers, the captain, a female marine biologist and an Indigenous tribalist venture after the great beast, who will meet them on its own turf.

Captain Nemo (José Ferrer) is found in suspended animation under the sea and revived by modern-day Navy men in order to battle a fiendish mad scientist (Burgess Meredith).

In a tributary of the Amazon, a monster – half-man, half-fish – is captured and placed in a reservoir in a Florida national park to be observed by scientists.

This third film in the series follows a group of marine biologists attempting to capture a young great white shark that has wandered into Florida's Sea World Park. However, later it is discovered that the shark's 35-foot mother is also a guest at Sea World. What follows is the shark wreaking havoc on the visitors in the park.

A civilian oil rig crew is recruited to conduct a search and rescue effort when a nuclear submarine mysteriously sinks. One diver soon finds himself on a spectacular odyssey 25,000 feet below the ocean's surface where he confronts a mysterious force that has the power to change the world or destroy it.

James Cameron teams up with NASA scientists to explore the Mid-Ocean Ridge, a submerged chain of mountains that band the Earth and are home to some of the planet's most unique life forms.

Notorious killer whale Tilikum is responsible for the deaths of three individuals, including a top killer whale trainer. Blackfish shows the sometimes devastating consequences of keeping such intelligent and sentient creatures in captivity.

A deep sea submersible pilot revisits his past fears in the Mariana Trench, and accidentally unleashes the seventy foot ancestor of the Great White Shark believed to be extinct.

Julie, an American on vacation in Mexico, spots a giant, one-eyed amoeba rising from the ocean, but when she tries to tell the authorities, no one believes her. She finally teams up with a marine biologist in an attempt to destroy it.

Dr. Jake Terrell, who has been training a pair of dolphins for many years, has had a breakthrough. He has taught his dolphins to speak and understand English, although they do have a limited vocabulary. When the dolphins are stolen, he discovers they're to be used in an assassination attempt. Now he is in a race to discover who is the target, and where the dolphins are, before the attempt is carried out.

The crew of an experimental underwater nuclear base are forced to struggle for their lives when their explorations disturb a creature who threatens to destroy their base.

A spacecraft is discovered on the floor of the Pacific Ocean, presumed to be at least 300 years old and of alien origin. A crack team of scientists and experts is assembled and taken to the Habitat, a state-of-the-art underwater living environment, to investigate.

Two biologists set out on an undertaking as colossal as their subjects—deciphering the complex communication of whales. Dr. Michelle Fournet and Dr. Ellen Garland journey to opposite hemispheres to uncover a culture eons older than our own.

After an earthquake destroys their underwater station, six researchers must navigate two miles along the dangerous, unknown depths of the ocean floor to make it to safety in a race against time.

Several people disappear from and at the sea. Their bodies are found gnawed to the skeleton, even the marrow is missing. The scientists have no idea which animal could do such things. Dr. Turner begins to suspect that the company which builds a tunnel beneath the bay might have poisoned the environment and caused an octopus to mutate to giant dimensions...

At a used car lot, Mr. Magoo is intent on buying a car for his nephew Waldo. He is slick talked into buying an old clunker thanks to a shifty salesman but he drives it off anyway. Unfortunately, the myopic Magoo drives off a pier and under the ocean where he mistakes the various aquatic surroundings such as fish, sunken boats, and seals for other cars, dilapidated mansions, and a horn happy driver respectively.

Irwin Allen explores the mysteries of the deep blue sea in this Technicolor documentary. Based on Rachel L. Carson's famous study, this Oscar winning project investigates everything under the sea, from sharks, whales and octopuses to microscopical creatures and their coexistence in this vast underwater world.

The crew of a West of Ireland trawler—marooned at sea—struggle for their lives against a growing parasite in their water supply.

Mary Beth is a marine biologist that gets annoyed when a dog called Zeus stows aboard her research boat. Nevertheless she is intrigued when the intrusive canine makes best-friends with her captive dolphin, Roxanne. She falls in love with Zeus's owner, Terry, a musician who rides a bike.

An island blows up, and from its remains a black poison fills the ocean. A team of underwater specialists with high-tech gear have to stop the poison before it contaminates the earth, but things get increasingly bizarre the more they investigate.

When a group of marine biologists crash land in the Bermuda Triangle, they realize they have stumbled into the lost city of Atlantis. But they quickly discover the city isn't friendly, and its humanoid inhabitants are planning worldwide domination using the piles of weapons and technology that have fallen through the Triangle over the centuries.

A beautiful island is home to thousands of species of aquatic life. Now there is a new species: the 5-Headed Shark is all heads and teeth. Shaped like a demented starfish, this monster terrorizes the open ocean before invading the beaches of Puerto Rico, endangering the once peaceful island paradise.

With their father killed by a swarm of vampiric sea creatures, Bering Sea adventurers, Joe and Donna, team up with a marine biologist and her devoted deckhand to render the species extinct.

Marine biologist Jack Ellway and his son Brandon are drawn to the Polynesian island of Malau to study the effects of recent seismic activity on the area's marine life. Along with the local doctor Alyson Hart, they soon become caught up in the investigation of a series of recent drownings with unexpected results. As Jack explores the surrounding ocean for a mysterious marine creature, Brandon discovers and befriends a three-foot-long baby creature that is able to leave the ocean and walk on land. As more dangerous and giant creatures come onto the island, and the military begins to take offensive action, Jack must risk everything to save the creatures, the island and his son. Written by ADAM G. THOMAS

Two adventurers set sail to find a giant man-eating great white shark.

A routine drone survey turns deadly when Ryan Johnson, a marine biologist based in South Africa, films a humpback whale being attacked and strategically drowned by a Great white shark. This is a total perspective shift for the creature.

The largest predator on the planet, the sperm whale, is your host for an amazing exploration of the final frontier – the world at the bottom of the ocean. From the makers of the Walking With series comes this incredible marine tour, in which you'll witness a rarely seen world of hidden mountain ranges, majestic canyons, volcanoes and the beautiful and often deadly creatures that inhabit the deep sea.

Follow ocean legend Sylvia Earle, renowned underwater National Geographic photographer Brian Skerry, writer Max Kennedy and their crew of teenage aquanauts on a year-long quest to deploy science and photography to inspire President Obama to establish new Blue Parks to protect essential habitats across an unseen American Wilderness.

Liz Bonnin is setting out on a global mission to reveal the full scale of the world’s plastic problem – and explore ways in which this looming environmental disaster might be averted. As she chases plastic around the world, Liz is going to show us that this is a crisis far greater than we’d ever imagined…

Dexter Harris, a marine biologist and devoted family man, comes home to find his wife and child murdered during a home invasion. He hopes for justice; however, his family's murderers are sentenced lightly. On the edge of a mental breakdown, he seeks the help of a psychologist, Dr. Miranda Miller, who diagnoses him with post-traumatic stress disorder. After only a couple of visits, Dr. Miller's therapeutic relationship with Dexter is on the verge of becoming compromised by Dexter's progressive mental instability. Dexter begins to mentally replace his deceased wife and child with Dr. Miller and her daughter. Finding out that Dr. Miller has a husband, Kevin Miller, infuriates Dexter and sets him on a path of destruction. Kidnapping and brutally murdering Raymond Tucker, his family's killer, he continues on this hunt and kidnaps Kevin. Suspecting that Dexter is responsible, she races against time to find Kevin before he becomes the next victim.

An ecological drama/documentary, filmed throughout the globe. Part thriller, part meditation on the vanishing wonders of the sub-aquatic world.

An unlikely team of activists and innovators hatches a bold mission to save endangered species.