Frederic "Didi" Dumas

• Frédéric Dumas (14 January 1913 – 26 July 1991) was part of a team of three, with Jacques-Yves Cousteau and Philippe Tailliez, in which he was nicknamed Didi.
• They had a passion for diving, and developed the diving regulator with the aid of the engineer Émile Gagnan.
• Frédéric Dumas then participated with Jacques-Yves Cousteau in the discovery of the underwater world and in bringing it to the attention of the general public.
  
• Dumas Wiki