Swim forward until you enter a cutscene, and afterwards awaken on a beach. Move forward towards a small shore-wrecked board that is upside down next to the bigger ship and look out towards the water and the terrible storm. Enter the ship through the ripped hull and there will be some crates on your left. Circle around the backside of them to find a record nestled on the ground that you can interact with to unlock:
Go up the ladder in this area and go left when you can to see a machine straight ahead, you can interact with its levers. Imagine they are numbered 1-2-3-4 from left to right, interact with them 3-2-4-1 and then interact with the lever next to the machine. Follow the wire from the machine to another machine on the wall where the walkway splits, interact with the lever on that machine as well. Keep following the wire out of the ship to the last machine which, after interacting with the lever, should bring light to the nearby camp. Head forward and in the left tent, in a box next to the turned over barrels with holes in them, you can find a can of sardines you can interact to unlock:
There is another machine next to the overturned barrels, so interact with the lever before heading to the tent across the camp. Enter the photo development area (should be the red lit area) and look at the hanging photos for possessed doctor and strange footprints. Enter the cave area at the back of the camp that was lit from the previous machine and enter the only tent there. Directly underneath the projector is a Note about De Witt stabbing Frank, next to the projector is a weird translucent cube which gives unknown structure and on the wall behind the unknown structure is a calendar. Underneath the calendar, just to the left on the table are two notes on Harry's findings, and finally on the table is a box you can open to look at the piano symbols. Interact with the piano and play every single note, then exit out of the piano screen and interact with it again. Play the keys in the order of the screenshot below to unlock:
On top of the projector you can find two buttons that you can interact with. Keep hitting the right one until the end and then interact with the screen to unlock:
Reset the slides all the way to the left then exit out of the tent, and out of the cave back into the main camp area. Here you will want to exit right and head up the mountain side, looking for a bridge on the left to cross over eventually. As you come out into the opening, head to the right, and all the way down the stairs to find an indicator of the sea levels. Head all the way back to the projector and move the slides until you mention that the slide is the right one (should be the lowest level tide without the diamond being empty). Interact with the projector screen to get the right tide level indicator. Exit out of the tent and take the stairs to the left, and go left all the way up to find a mural that you can interact with. Head all the way back to the ship and enter the far room that we neglected earlier, interact with the floating stones contraption for the next puzzle.
Interact with the knob on the far left to turn the machine on. You will have to use the three different dials to make the three rocks on the right be on same level, and have all the green bulbs lit at once.
Head out of the ship and around to the back of the ship, on the middle table next to a hammer and crate is a note with how Harry Activated the Organ. Head up the nearby mountain path and back across the bridge to the left. Back in the open area, interact with the stone formation looking out to the ocean to open up the new puzzle. You will see seven symbols and some black goo as well, if the black goo is underneath the symbol it means that it is open and if it is grey it means it is closed.
Head back into the tunnel we came through and there'll be a symbol on the left side with one dot. Interact with it to make sure the lower portion of the symbol is empty/black. Turn around and go back towards the puzzle, but coming out of the tunnel turn left and look to the left where you should find another symbol. This one has two dots, again interact with it to make the lower portion empty/black. Keep following the wall to the next symbol, which looks like two triangles going sideways. Interact with it to make the symbol on the lower portion so the top is grey. Go down the nearby stairs to find a symbol with four dots and interact with the symbol to make the symbol on the lower portion so the top is grey.
Head back up and across the area to the top of the stairs, where another symbol with three dots can be found. Interact with it to make the symbol on the lower portion so the top is grey. Head down the stairs to find the last symbol we need to interact with, which is two triangles going vertically. Yet again, you need to have the lower portion empty/black. Return to the puzzle and it should look like this:
Turn around and interact with the pedestal in front of you until the whole pit in front is blocked. Swivel back around and interact with the button on the puzzle, a bridge will form and you'll also unlock:
Head across the bridge, following the path around and interact with the button to be taken up an elevator. Interact with the box to read Harry's Third Letter, then hit the four buttons on the stone next to the box and finally the middle one. You can now follow the path back down, straight through the tunnel and through the newly opened path ahead to finish the chapter.
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