The first level is extremely linear but to give a simple explanation of how to complete it:
1. After waking up, go through the door to your right and down the stairs to the generator room
2. Facing the generator, crawl through the pipes to your left and continue on to a control panel
3. Activate the control panel (you should get a cinematic while doing so) and return to the deck of the ship
4. Climb the ladder to the crow's nest and use the zip line for a cinematic which ends the level