Important areas
Start 1 – You will begin the exploration of the ship assuming you've chosen passageway 1 (a successful climb near the metal construction).
Start 2 – You will begin the exploration of the ship assuming you've chosen passageway 2 (using rope arrows to reach the ship).
Starting point – Garrett will end up here after using the interactive pipes (beginning of the exploration of the ship).
Shaft entrance – Using this ventilation shaft will allow you to safely go past the main area which is heavily guarded.
Shaft exit – The exit from this shaft is located next to the main area so you don't even have to explore it if you don't want to.
Passageway to the second part of the ship – This is your destination and you can reach it only by using the western staircase.