Reward: Shipwreck Beach Relic Map
Head up the steps and use the panel to electrify the floor, way to go Lara, and then return downstairs and open the doors. Enter the right room and blast the boarded doorway open and then fire your bow across the way to light the clothed pole on fire. With the raft now free, pull it multiple times until it is close enough to jump on and then use it to reach the other side of the wall.
Standing facing the other set of stairs, look up and spot the roped banister. When pulled, the weight will pull the electric light out of the water, de-electrifying the water so you can quickly pass. From the other side, pull the raft to the light and then pull the light up and the raft under to prevent it from re-entering the water. Lara can now wade through the water to the stairs on the other side of the room.
