LogFAQs > #922314015

Spoilers I guess

but they send a team to drain the tanks under the reactor and their flashlights start to malfunction presumably from the radiation and eventually go out and the episode ends. It gives you the feeling that they are in a hopeless situation and will likely end up lost and dying down there.

Then the next episode begins and retconns all that, their lights barely dim for a moment and they find the valve and are out easy peasy.