Quote: (Originally Posted by Rod Baverstock)
I am looking at getting a Submatix semi -closed rebreather .
Contact the Submatics people in the UK and I'm sure they will put you onto somebody who will 'try dive' you on one. If all you want is a gas extender and you know about nitrox a semi is quite a good deal but getting one in the water will answer more questions than we can ever do here.