Shells To Diving Diving Helmets: Turtle

: They thinly sliced and polished the outer layer of the shell until it was transparent, allowing them to see clearly while diving for pearls.

: Persian divers used polished tortoiseshell to create diving goggles. Turtle Shells To Diving Diving Helmets

: Its resemblance to a turtle shell was so strong that the nickname "turtle helmet" became standard among soldiers. 3. Modern Lightweight Helmets (1960s – Present) Modern Evolution of Diving Equipment : They thinly sliced and polished the outer

: These helmets were often referred to as "copper hats" and were designed to withstand immense pressure for salvage and underwater construction. 2. The "Turtle" Helmet Nickname (1940s) Turtle Shells To Diving Diving Helmets