No mention made of the cave-in risks of heating a long-unoccupied cave

From BearWiki

Claim: Heating a long-unoccupied cave risks being crushed in a cave-in.

While caves can be very effective survival shelters, and often heating can be necessary, it is worth mentioning that this comes with several caveats. The risk of carbon monoxide buildup if there is inadequate ventilation is an issue, as are general cave dangers if it is more than just an overhang (wild animals, insects and snakes, etc). However, one important issue to remember is cave collapse.

A cave that is not regularly used by human activity may be in any state of collapse. While the odds of a cave collapsing on you without you doing anything to it are generally very slim, fire can change the equation. Heat causes rock to expand, flexing the joints and encouraging loose pieces to come down.

Optimal use of fire to warm a cave, as far as reducing the risk of cave-ins is concerned, is to have the fire located just outside the cave so that the smoke can rise up but infrared can more gently heat everything inside the cave. A backdrop of rocks behind the fire can help reflect heat in. Lastly, if a fire must be inside a cave, putting it in an area with a high, sloping ceiling can help reduce the heat load on the rock as well as reduce the asphyxiation risk.

In a survival situation, you take what you can get, but you should know what your risks are and how to reduce them.

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