Did being alone underground for months warp his mind...?
Or do you have to be pretty bent to start with to do what every non-warped person doesn't do, because they can foresee it would really suck....
To me it seems pretty difficult to argue that the time spent underground did not affect his mind, regardless of the state it was in before.
Tragic - I'd hesitate to tie the cave experiments to the death, but it sure looks bad. It doesn't seem like humans are designed to cope well with long isolation and detachment from reality, but deprivation tanks and other practices show significantly positive results.