The movie starts with a rescue crew looking for a missing research submarine that vanished in very deep water. The rescue crew finds the missing research vessel and finds it to be full of holes, "eaten" away badly by fast-acting, iron-eating bacteria – the reason it sank.
While looking for the first missing submarine, they happen to be behind a large outcropping of rock just as a powerful sonar pulse sweeps by and hits the sea floor. Their onboard radiation detectors show that, if they had been in the direct line of the blast, they would have been irradiated to death.
The rescue crew now finds itself with malfunctions and their own vessel in peril (due to the aggressive bacteria), and pretty much lose all hope. Nearly a day goes by with them trying to figure out a way to resurface but to no avail. A gigantic submarine slowly drifts over them from out of no where, then latches on and hauls them into its bay.
The gigantic submarine seems deserted and this confuses the rescue crew as they wonder who just saved them. Later, they find the crewman that saved them badly irradiated and begging for help near the lift controls in the bay, the only reason the crewman brought them on board. Long story short, the submarine is a gigantic research vessel of Russian origin searching for oil illegally. The submarine is nearly deserted as it had its own accident; its nuclear, high-power sonar accidentally activated in the up position in the bay, killing nearly all the crew.
The gigantic submarine is also slowly being eaten away by the iron eating bacteria and the rescue crew eventually find the madman captain and a surprise in the form of the wife of one of the rescuers long thought dead, lost at sea years ago.
Language: English. Time period in movie, modern day. Time period the movie was out, I watched it on Amazon Prime 2 years ago, so it is within 5-7 years old. No big name actors