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Danger from the Deep Danger from the deep (aka dangerdeep) is a Free / Open Source World War II german submarine simulation. It is currently available for Linux/i386 and Windows, but since it uses SDL/OpenGL it should be portable to other operating systems or platforms. Read more hot omron++ omron++ is the simplistic peace-endowing warfare simulation. OpenSSN OpenSSN is a modern submarine simulation that tries to balance fun, realism, and simplicity. Players are able to explore, detect ships, and manipulate sonar.