"It is not most certainly a cave you can just walk into," Trout said. Local Forest officials say the cave could be too fragile for foot traffic. In addition, they point out, it's not safe.

Plunged into the darkness surrounded by a spectacular shaft of light, these stunning pictures show daredevil explorers lowering themselves into a deep cave on the abseiling trip of a lifetime.

Macroinvertebrate biologist Steven Taylor at the University of Illinois has spent 20 years delving into the ... or any other light-sensing organs. With a handful of other cave biology specialists ...

We’ve come to understand that caves are full of life, brimming with sponges; shrimp; sea stars and urchins; and bristled, segmented worms, all adapted for life in low-light environments.