What indication is there that cave might not be safe?

Indications that a cave might not be safe include signs of rockfall or loose debris, which can pose a risk of injury. Additionally, the presence of water pooling or flooding within the cave can indicate unstable conditions. If there are signs of wildlife, such as bear or bat droppings, it may also suggest potential hazards. Lastly, if the cave is poorly lit or has narrow passages, it could increase the risk of accidents or getting lost.