This slide wire is a "tyrolienne" and with more than 500m these is the longest in France. It is one of the attractions to attract new visitors to the vallée du Dessoubre.
The access is denied for any outdoor activity during winter and spring up to the 15th june.
And they consider that "caving" and "cave diving" is an outdoor activity

What a shame, it's my favourite dive in the Doubs. So diving is allowed after 15th June then? When does the season end?