There are many different types of caves, and some can be relative safe with multiple exists and a lot of space to move in. That said, proper training and equip

There are many different types of caves, and some can be relative safe with multiple exists and a lot of space to move in. That said, proper training and equipment can not eliminate a lot of the risk involved. Equipment can always fail, people can get stuck, and the environment is often such that a single minor wrong movement will causes clear water to become instantly zero visibility. Diving in old mines has also risk of collapse and unless you are diving rebreather you are also introducing new air into the environment. Exploring a new unexplored mine like the one in the article is risky even for the most trained and well equipped divers.