Daniel Brown/Business Insider We saw a compartment on the USS John Warner called a "lockout trunk." Lockout trunks are used as an escape hatch for the crew and to get SEALs off the ship. During our recent tour of the USS John Warner nuclear-powered submarine, we got a chance to see a small compartment known as a "lockout trunk." "This is actually how we would get SEALs off the ship submerged," Senior Chief Mark Eichenlaub told Business Insider. "So you would stick a platoon of SEALs in here, 14 guys ...