IDK if accidently shooting it sometime in the mission breaks it and you cant use it but you just treat it as you would when entering a vehicle. First get Alexey...it has to be Alexey near it then you should get that enter vehicle thing...he gets on it. Then you Direct control him, go to the Sub and then get out of DC. Get him off the welder then hover over the porthole and you should get that padlock icon and it should work.....if not then idk
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