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Dateline: 2067

Setting: A research base at the bottom of the Marianas Trench

Depth: 10,000 meters.

Mission Duration: Thirty days

Note: This is a follow-up to my previous question: What would drive people to risk death in the deep?

A research base lies at the bottom of the Marianas Trench, housing 10-12 scientists of both sexes and a cat.

This tightly knit team has been hand-picked and intensively trained for a high-risk mission that cannot and must not fail. After a series of deep sea missions, they will be sent to Jupiter in order to replicate these missions in the depths of the seas of Europa, where the only other life in the solar system might exist.

Each of the crew members has gone through rigorous psychological profiling, testing, and any possible genetic markers of mis-content have been genetically sliced away.

These guys are the cream of the crop, the best of the best for this mission.

However, one by one, they start to die, and it becomes obvious that their deaths are not accidental.

Question:

What possible reason could cause one (or more) team members to kill the others that would not be anticipated by the training they've undergone?

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closed as off-topic by sphennings, Vincent, Josh King, kingledion, Mołot Dec 4 '17 at 15:59

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    $\begingroup$ Comments are not for extended discussion; this conversation has been moved to chat. $\endgroup$ – James Dec 11 '17 at 17:51
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A mold or fungus.

Similar the Ergot fungus, this organism is causing delusions and paranoia. One of the crew has been working in an area that is infested with it. His paranoia makes him keep it secret as he's convinced that one by one, the other crew members are out to get him.

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