The Deck - From the Cavern Floor to the Upper Deck
If you miss any of the jumps while climbing from the LOWER-MIDDLE DECK to the OVERTURNED HULL, or if you go after the Jade Dragon and wind up back on the MAIN DECK before obtaining the STORAGE KEY, you won't be able to climb back onto the metal duct from below. You can either use the corner bug to get up onto the duct (as described in a footnote following the main walkthrough). Or, use this shortcut. It's not exactly short, but it's faster than going all the way back through the SUBTERRANEAN LAKE with the inflatable raft.
Take a running jump from the left side of the MAIN DECK onto the overturned hull...
...and slide down to the cavern floor.
Go around the overturned hull to the movable crates near the STERN ENTRANCE.
Climb on top of the two stacked crates (assuming you moved them earlier to access the STERN).
From there, you can see a ledge built into the corner of the overturned hull. It's a bit hard to make out in the dim light, but it's outlined in the screenshot above. Carefully position Lara in the middle of the crate, facing that ledge.
Hop back. Then take a running jump toward it, veering left while in the air...
...to nail the landing. Take care not to run off the far edge.
Turn around take a running jump into the opening on the cavern wall.
Pick up the main walkthrough with the section titled "CAVE WITH STEPPED BLOCKS."
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