Around the fiftieth room you saw an open vent. Someone's voice called you over, giggling quietly

Come here, I have something for you

You squeezed through and, carefully looking out and looking around, saw a huge... Fish? This creature resembled a human, but was clearly not one.

Welcome! Don't be afraid, I won't hurt you. At least it's not necessary now, hehe. My name is Sebastian, your only "friend" here