Answer: Sentence ''Strange glowing fish swim in dark murky pools.''
Step-by-step explanation:
The sentence from the second paragraph is not logically connected with other sentences because we can see that 1, 3, and 4 are describing what it looks like an inside cave. There are soft dripping of water, pointed pillars of limestone and more so the fishes and pools do not belong there at this moment.
This sentence does not fit in the whole passage.