To survive the Tsunami, Lara needs to get to higher ground. AS Lara is carried by the water current, use the movement keys to avoid her get hit by any major object. Eventually she’ll hold on to a door and enter a flooded room. Swim forward and pry open the door to enter the next room. Swim up and get inside the bus stuck in the flooded room. Break open the rear glass of the bus using interaction key. Keep moving forward and Lara will climb on to some debris floating on the water. Keep running and jumping on to the next floating object until you reach the end where you’ll have to make a jump and hang on to the craggy wall. Climb up the building. Jonah will be there and a cut-scene will start.