Dräger Misch Gas Gerät DM20 und DM40
In 1909, Dräger developed a series of hoseless helmet diving systems known as the Gurtel Taucher Apparat the DM20 and the DM40 diving apparatus. The Gürtel Taucher Apparat is described here. The DM20 is a system intended for diving to a depth of 20 metres for up to 3 hours on pure oxygen. The diver carries two oxygen cylinders on the back with a scrubber mounted between them. The DM40 is a semi-closed system and can be viewed on this page.
Therebreathersite was founded by Jan Willem Bech in 1999. After a diving career of many years, he decided to start technical diving in 1999. He immediately noticed that at that time there was almost no website that contained the history of closed breathing systems. The start for the website led to a huge collection that offered about 1,300 pages of information until 2019. In 2019, a fresh start was made with the website now freely available online for everyone. Therebreathersite is a source of information for divers, researchers, technicians and students. I hope you enjoy browsing the content!