One of many types of rebreathers

In the picture is the Optima rebreather prototype from Dive Rite. Also at Inner Space was the KISS, which is a really very well designed rebreather, some Megalodons, a couple Dragers, one Ouroboros, which is a very nice rebreather, and if I remember any more I'll add them leter. Of course, the Inspiration and Evolution were there aplenty too! (saving the best for last!)