Conversation so far:
What is the organization GERS?
Cousteau and Tailliez showed Épaves to Admiral Lemonnier, who gave them the responsibility of setting up the Groupement de Recherches Sous-marines. Later it became the GERS.
What did the GERS do?
The GERS small team undertook the exploration of the Roman wreck of Mahdia.
Are there any other interesting aspects about the Jacques Cousteau article besides the GERS small team undertaking the exploration of the Roman wreck of Mahdia?
In 1947, Chief Petty Officer Maurice Fargues became the first diver to die using an aqualung.

Question: What is an aqualung?
Self-contained rewrite: What is an aqualung device?