SWAT but with SCP shenanigans as many said previously ITT
BUT
Half the game is locked behind you beating it on the hardest difficulty. After doing so you unlock the 2nd campaign where you play as Chaos Insurgents infiltrating various SCP facilities and installations. Obviously including a maritime one, either an "always on the move" ship or an oil rig. And it's obviously raining during it.
or
a Splinter Cell-like featuring either an U.S. spy or a Chaos Insurgent spy infiltrating SCP facilities.