Best Practice for using Closed-Circuit Rebreather for Scientific Diving at work

The use of the CCR breathing apparatus for scientific diving at work is relevant for all depth zones depending on the targeted objectives (to approach the wildlife in the river, for behavioural studies of ichthyofauna, to implement sensors or perform core sampling, for eDNA sampling by pumping in the MCE…). The recommendations will have to concern all the profiles of divers, with differentiated parts according to the level of engagement1. Underwater sound measurements of marine life (fishes) used rebreather for a long time (Lobel, 2009), while the exploration of the twilight zone by R.Pyle (Pyle, 1999) highlighted the deep occupational scientific diving work using CCR