They arrive at an ancient temple, now ruins, but a path of pure aquatic energy lights their way. They discover a cypress tree at the bottom of the ocean, just like theirs, except this one posesses the gift of waterbreathing just like the Marines. Its network of roots extends in all directions to the different continents.
They find a piece of rusty metal infecting the tree, probably discarded unknowingly from a merchant ship above weeks earlier. The Marines remove the metal and the tree begins to heal.