The first dive in heavy diving gear took place in 1879 when Nello Ottonelli ventured down to 23 metres (75 ft).

Dr. Henri Louis Joseph Ayme organized exploration of the basin and on 24 September 1938 Negri reached a depth of 27.5 metres (90 ft).

It was then necessary to wait for the arrival of the scuba diving suit in 1946 when Jacques Cousteau reached 46 metres (151 ft), then 74 metres (243 ft) nine years later.

This is the limit of dives with air.

In 1981 Claude Touloumdjian reached 153 metres (502 ft) with an oxygen-helium mixture.

Finally, in 1983, Jochen Hasenmayer reached 205 metres (673 ft).

To go even deeper and touch the bottom it would be necessary to use robots.

In 1985 the Modexa 350 Mission removed the mystery about the depth of the system.

The robot touched bottom at a depth of 305 metres (1,001 ft).

In 1989 another robot, Spélénaute, (SSFV) reached the lowest point known to date in the siphon at a depth of 315 metres (1,033 ft).

In 1997 the diver Pascal Bernabé descended to the depth of 250 metres (820 ft).

In 2014 a virtual tour was created by the photographer Christoph Gerigk in collaboration with the Speleological Society of Fontaine de Vaucluse (SSFV) from 360° spherical panoramic views.
The first dive in heavy diving gear took place in 1879 when Nello Ottonelli ventured down to 23 metres (75 ft).
Dr. Henri Louis Joseph Ayme organized exploration of the basin and on 24 September 1938 Negri reached a depth of 27.5 metres (90 ft). 
It was then necessary to wait for the arrival of the scuba diving suit in 1946 when Jacques Cousteau reached 46 metres (151 ft), then 74 metres (243 ft) nine years later. 
This is the limit of dives with air. 
In 1981 Claude Touloumdjian reached 153 metres (502 ft) with an oxygen-helium mixture. 
Finally, in 1983, Jochen Hasenmayer reached 205 metres (673 ft). 
To go even deeper and touch the bottom it would be necessary to use robots.
In 1985 the Modexa 350 Mission removed the mystery about the depth of the system.
The robot touched bottom at a depth of 305 metres (1,001 ft).
In 1989 another robot, Spélénaute, (SSFV) reached the lowest point known to date in the siphon at a depth of 315 metres (1,033 ft).
In 1997 the diver Pascal Bernabé descended to the depth of 250 metres (820 ft).
In 2014 a virtual tour was created by the photographer Christoph Gerigk in collaboration with the Speleological Society of Fontaine de Vaucluse (SSFV) from 360° spherical panoramic views.
Fontaine de Vaucluse (spring)