Related Clues:
- Beware of grot
- Look out from hiding-place?
- Potholer takes northern chamber underground
- Beware of sailors in a Liverpool club!
- Hollow - warning
- Warning - grotto
- Large 24 chamber
- Large underground hollow
- Vast dark space
- Natural subterranean opening
- Large underground chamber
- Carlsbad feature
- Home for some bats
- Surrender, so to speak
- Bat hideout