Cenote – San Cordoba Challenge Tomb (part 1)

Climb out of the pool and follow the path around to the right (starboard) side of the ship.

Stand near the wooden raft and press Interact to kick it out into the water.

Now climb onto it and jump to grab a handhold on the hull of the ship. Climb/jump up, left, and up again to reach the deck.

Here you'll find a wooden barrier preventing you from reaching the captain's quarters, below. You'll need to break it open. Follow the stairs down to the deck below.

Grab the handle...

...and pull it to turn the capstan and swing the dangling cannon around toward the stern of the ship.

When it's in position above the barrier on the deck, Lara will say, "The falconet's in position."

Before continuing toward the bow of the ship, head for the gap in the port side railing near the capstan you just turned.

Jump overboard and swim down and to the left...

...to find a relic (4/5), a Rusty Sword (Conquerors), in an ornate little chest on the bottom of the pool.

Climb out onto the rock. Then climb the ladder to get back onto the ship.

The ship is more or less broken in half. To reach the bow, you'll need to drop into the water below the capstan you turned before.

Swim down and loot a resource container on the left.

Then head forward and right, and pry open the iron gate.

Take a breath. Then swim through the gate and follow the narrow passageway...

...until you can surface and climb out of the water. Rifle another resource container off the left. Climb onto the ledge above for some cloth. Then follow the ledge around to the right.

Scramble up the wall to grab the horizontal hole. Then scramble up again to grab the curved boards above.

Climb then jump left to the horizontal pole, swing and jump toward the wall, and quickly scramble up onto the deck above.