Trailer here.
The movie begins with a scientist who is working with sea creatures. Something goes wrong and a huge octopus attacks everyone. Cut to the Shining Sea Aquarium where Miranda(Eva Ceja) is working in the lab. There is a call from a place called Eden Zoo sating that they need to destroy a certain batch of medication because it is dangerous to the creatures. The medication has disappeared though. Senator Blackburn(Anthony Jensen) and his assistant, Beth, show up to meet Miranda. Miranda gets a call from the scientist from the beginning of the film. She is really panicked. A woman called Clu(Fox) is there and she finds out what happened with the octopus.
The fire service are called in. Two firefighters see a crocodile outside the aquarium. Miranda tells the people trapped inside that they need to climb through a duct to get to a fire door. They run into Daniel and Sylar. Miranda realises that the medication has caused the catastrophe. Daniel is to blame as he never destroyed the medication. The firemen get inside the aquarium. Miranda and her group meet a walrus and a crocodile who want to have them for lunch. Skylar dies. Clu calls Miranda and tells her that she can't open the doors to let them out. They need to switch on the power manually. They work out that the creatures are actually blind. The group have to go through the shark exhibit to get to the basement and switch on power. Beth gets attacked by a starfish. She dies. The Senator gets finished off by an octopus. Miranda climbs across into the basement which is flooded. She turns on the power.