Hi Alain,

The GR20 certainly looks like a pretty tough trail. When looking for some information on the GR20 it said that no tents were allowed to be pitched along the route, only near designated 'refuges' or mountain huts are allowed. Could it have been that some hikers in an attempt to keep pack weight down decided to just rely on the facilities provided by these mountain huts. It might have been that the hikers therefore did not take a tent and sleeping bag (which may have saved the hikers lives)? If the fog came down, navigation to these mountain huts would have be crucial as other escape routes from the trail were very limited.

Corsica looks like a fantastic place from the photos on http://www.touchingthelight.co.uk/corsica/index.html