in the longer half of the ship, at the very top where the ship is cracked in half. The elevated spot you can reach with either a ladder or crossing a fallen beam. Very often i cannot climb it if im trying to climb it from the botto, sometimes i can but 99% of the time i cannot. The option to climb it does not pop up. However, if i try to climb it from the top, it doesn't put my character on the ladder, but suspended in the air climbing nothing.