The abilitiy to lock the submarine#35816

Countless of times someone just jump in my submarine when i buy it, or just hope on behind in the dou submarine, it should have the ability to be locked like a car from the inside, not saying with a keylock necessarly but any mechanism. Maybe add a ship dock which allows us to modify it or lock it at least

or lock it by an embedded lock from the inside just like how we used to lock cars before adding keylock into them