The French Oxpro explorer is a semiclosed rebreather designed to be used in the 40 MSW range with nitrox. It was shown at the "Salon de Plongee" in Paris this year (2008). The design of the unit is still in progress. Here you see some pictures sent to me by Alain Thomas. The rebreather can be found on a dedicated website here: http://www.oxpro.fr/