Swim along the channel until you reach the first valve.
Turn it and swim out through the broken off grate above.
I’d also recommend turning on Duke Vision.
Now you should probably follow the yellow pipes that will lead you from valve to valve.
Plant the first explosive on the grate below two pipe bows and swim further.
Keep following the designated route until you reach a valve with a RPG lying beside.
Be sure to pick it up, as you will have to fight the second to last boss.
On both sides of this underwater battlefield there are wrecks of sunken EDF dropships with infinite supply of ammunition.
Aim at the worm’s head and keep moving between the wrecks.
Don’t stop even for a moment, as the boss will attempt to crush you.
Now swim into the channel from which the worm came and swim out through the hatch at its end.
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