Red Ocean is a 2007 first-person shooter video game developed by German company Collision Studios.

Jack Hard hires a fellow diver to explore an old World War II submarine.

An operative contacts him over the radio telling him that his fellow diver is actually a member of the CIA.

The plot takes place in an abandoned, underwater, secret Soviet base that has been taken over by terrorists.

Jack Hard is tasked with exploring various locations in the underwater Soviet base, while defeating enemies and engaging in scuba diving.