One dive with the legendary "Medi Nixe"or with the original Hans Hass rebreather succeeded not yet. But a backpack rebreather is really easy and fast build from parts of the RG-UF/M, and other, more modern materials, I said to myself ....
Here you see the result of two or three days of practical work. The unit is extremely small, lightweight, completely filled with lime and oxygen, it weighs only 6.3 kg,and it is can actually transported in the from Hans Hass described briefcase.
a little testvideo are here: RR1 oxygen rebreather at the lake "Hasse"