• Descent 305 - Pre-order is open!!

    Our August/September issue has a publication date of 2 August, and it is a special summer bumper issue full of stories of exploration and wonder from the underground world.

    Click here for details of this edition

Green river in Canada!!

Norbert Casteret once turned several kilometers of the Garonne green with fluorescein.

He was testing the hypothesis that water sinking at the Trou de Toro in Spain, which was about to be diverted for a Spanish water project, was the source of the River Garonne in France. He carried a huge amount of the dye on mules up into the Pyrenees.
 
Back
Top