These screenshots show the single-player game, but this battle works the same way in co-op mode.

The third and final phase is the same as the previous two. Choose a time bomb that's close to the basket if possible; otherwise you'll need to use remote bombs to nudge it closer before attempting to fling it into the basket. Again, place a remote bomb behind the time bomb—either on a raft or in the water.

Then detonate the bomb to toss the time bomb into the basket, while keeping the staff raised to slow the timer on the bomb.

Shoot the switch to lift the basket out of the water. Then raise the staff again to prevent the bomb from exploding too soon.

Wait for Sobek to eat the bomb.

Then, when he floats to the surface...

...climb onto his belly and explode a remote bomb on his weak spot.

If you manage to defeat Sobek in less than 3 minutes, you'll receive the LARGE MACHINE GUN.

As Sobek sinks to the bottom, the water recedes revealing the exit. Go up the stairs and through the door to the end-of-level treasure room.

[Part 2 | Return to the Tomb of Sobek Walkthrough]