: Baz and Garrow attempt to shut down the rig's pipes completely while exploring the pump control room.
: Cat reveals she is pregnant, a detail that the Ancestor seemingly recognizes and which adds a layer of personal urgency to the crew’s survival. : Baz and Garrow attempt to shut down
: Geologist Rose Mason deduces that the mysterious ash and spores found on the rig belong to "the Ancestor," which she identifies as the oldest organism on Earth. : Baz and Garrow attempt to shut down
: While investigating pressure malfunctions on the seabed, the crew discovers a strange symbol consisting of concentric circles. : Baz and Garrow attempt to shut down
: As rig boss Magnus MacMillan loses control of the increasingly paranoid crew, Rose takes a more prominent leadership role.