The use of rebreathers in caves is nothing new. Decades ago, Hans and Lotte Hass used them to venture into marine caves. Profiles like Rob Palmer in the UK, Bill Stone, George Irvine and Jarrod Jablonski in the USA, or Olivier Isler in Europe, are also strongly linked to rebreathers and cave diving.

One morning, sooner or later, you will wake up with a strange sensation—as if some minor and weird changes happened in your body overnight. You are not turning into another Dr Jekyll and Mr Hyde, but in the recent weeks you have come to find your dives to be very noisy with all the bubbles escaping from your regulator starting to get on your nerves. All your dive gear has also started to feel very heavy, with all these tanks and regulators to carry everywhere.

What is DIRrebreather? Since its implementation a few years ago, the Doing It Right (DIR) philosophy has gained in popularity not only in the cave diving community and amongst technical divers, but it has also spread to the recreational diving community across the world.