This program is designed to extend the diver’s knowledge in the use of EANx for sport diving. It further develops diving skills and provides a greater understanding of the EANx concept of diving. It is also intended to supplement the skills of Recreational Trimix Divers. The program employs EANx mixes from 21% oxygen to a maximum of 1.5 PO2 combined with a helium content that maintains an END no greater than 80 fsw (24 msw) may be used. This program qualifies divers to dive to 160 fsw (48 msw) and perform decompression stops required in dives up to 15 minutes.