You enter the next room which has an underground pool. However the ground next to the pool is quite unstable and gravelly and it collapses. So you all fall and take 1d6 damage as the water isn't terribly deep and there's some hard and sharp rocks in the water.  While flailing about in the water you see a many Goldfish floating behind you and cowering as a three feline monsters appear with a predatory grin. The goldfish look at you pleadingly asking for help.