Get off the catwalk on the bow and head for the exit to get off the ferry. Use the trap to go down to the pier and head right. Once you reach a destroyed section of the pier, use the broken planks to descend to the beach. Proceed to the right until you see a wooden, stilted house - head there.
Climb the ladder and circle around the house. You'll find a telescopic hook propped against one of the walls. Take it. Climb down the ladder and return to the pier the same way you came.
Zoom in on the cables hanging from the pole (near Bouruth). Drop them on the pier with the hook (active point on the pipe, on which the cables are hanging). Talk to Bouruth as he offers his help.
Get back on the ferry and head for the engine room. Enter the catwalk with the icebreaker control panel and lever - the one you used to shut down power on the ship at the captain's request when the kraken attacked. Now use the lever to turn the power back on.