The boulder was too large, and he was pinned in a position from which — even if he had companions who came to help — extraction was not achievable with the tools available.

His head and one arm remained free.

Whether he died from the crush injury itself, or from exposure and thirst in the cold darkness of the cave, is not something that can be established from the physical evidence.

His companions, if he had any, could not save him.

They may have tried and failed.

They may not have been present — he may have gone ahead while others worked elsewhere in the cave, or he may have been alone.

The position of his remains and the tools around him suggest he was working actively when the accident occurred, but there is no direct evidence of what anyone else in his party did.