Joseph Delteil (speleologist)
Joseph Delteil (21 March 1909 – 7 November 1979) was a French speleologist. Delteil trained as a carpenter before turning to speleology. In 1935, he participated in the exploration of the , revealing 3800 meters of active network. In 1943 and in 1946-47, he also participated alongside and Norbert Casteret to the exploration of the abyss of . His name is given to the 130 meter deep shaft located at the bottom of the "gouffre Raymonde", the major chasm of the .