Submarine

A submarine is a watercraft capable of independent operation below water.

Prometheus Sinking
The Mandarin's minion Hypnotia hid aboard the Russian sub Prometheus and planted a Bio-Conversion Device. She then opened a hole in the hull and sank the ship. During the next year the device converted the sailors into radioactive zombies. Iron Man looked for the ship in Operation Prometheus but was attacked by Whiplash, Dreadknight, Whirlwind, and Grey Gargoyle. Force Works showed up to help Iron Man but so did Fin Fang Foom and the team was defeated. The Prometheus Crew woke up and attacked the Hammer Channel Tunnel and were defeated by Force Works. Century then converted the sailors back to normal.

Re-Release of Omega Red
Omega Red was rereleased so that he could board a nuclear submarine that sank. He was the only person who could stand the radiation. He asked that Wolverine and Storm accompany him as they were the ones who captured him before. Omega Red then turned against his government and decided to attack the United States. Wolverine and Storm managed to defeat him and leave him in the ship as it sank to the bottom of the ocean.