human
Produce a detailed written description of a eerie scene inside a basement with a tank, shelves, and a sconce.
assistant
A lone sconce sheds minimal light about the chamber. The room appears mostly bare, though in the darkness, it is difficult to discern much of anything. Curious, zapping noises emanate from a tank on a not-too-distant corner, followed closely by flashes of light. A small set of shelves resides near the stairwell leading upward and out of the darkness.