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After the scuffle between Mann (Damon) and Cooper (McConaughey) in Interstellar, our protagonist gets a hold of a radio and alerts his shipmates to Mann's duplicity. Then his ship explodes. What happened there?

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2 Answers 2

It was a booby-trap set by Mann. It was activated when his robot was rebooted and the hidden data was accessed. Mann set it to cover his tracks and hide the fact that his planet wasn't habitable.

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I don't think the movie showed exactly why the base exploded but I agree with Brett. Mann must of set a booby-trap when rebooting the bot. The guy got killed(can't remember his name) did mention that the data does not look right –  Huangism Nov 13 '14 at 14:27
Pretty much this. Mann had been falsifying his data in an effort to have an exploratory team come to his planet to possibly rescue him. His robot had the real data, so Mann had to disable the robot unless he wanted his secret to get out. He likely rigged it to self-destruct in the event someone tried to get it back online, which would cause them to learn of his falsified data. When Romilly is looking at the robot's screen after he manages to reboot it, he notes the data he's seeing doesn't look right for what Mann had been reporting. Then, boom. –  MattD Nov 13 '14 at 15:19

When Cooper decided to leave to earth, Mann attempted to kill Cooper. Then, he flew using his shuttle and used the faulty maneuver to dock with the Endurance, which exploded the shuttle and killed Mann.

From wikipedia,

Amelia rescues Cooper, and the two give chase, arriving in time to witness Mann docking improperly with Endurance, which kills him when the airlock depressurizes

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Question is about the base on the planet, not about the shuttle. –  Entbark Nov 11 '14 at 19:45

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