As Marcus works to prevent the Virgil's return to the surface, he remembers where it all began.
Desperate measures are required to contact the surface, and Sam has a plan that just might work.
A mechanical failure spells disaster for the crew, as chillingly foretold by the retrieved data recorder.
A new discovery presents the crew with the most shocking and ominous riddle yet.
The discovery of an artifact in the water presents the crew with the most shocking and ominous riddle yet.
The crew attempt to explain the mysterious antagonist that faces them.
Marion is haunted by echoes of the past, and the crew are wary of their new arrival.
The apparent end to the trench has given way, and the crew struggle to understand the full consequences of their predicament.
With the bottom of the pit a mere ten minutes away, the crew begin to relax.
As technical issues accumulate, the crew experience a rare flash of hope.