If you miss any of the jumps while climbing from the 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 to the main walkthrough). Or, use this shortcut. It's not exactly short, but it's quicker than going all the way back through the flooded cavern 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 wooden crates and climb onto the top right crate. 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 so she's facing that ledge. Take a running jump toward it, veering left while in the air. . .
. . . to nail the landing.
Then turn around take a running jump from this ledge into the cave opening on the wall of the cavern.
Pick up the main walkthrough with the section titled CAVE WITH STEPPED BLOCKS (here).
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