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Looking to buy a new or used Halcyon Evolve 40 doubles wing. Willing to pay up to $400 depending on age and condition.

I just tried installing the OPV from my Halcyon DSMB onto a friends Hollis (non-SMS) wing (and vice versa) and they bold held air, despite looking different. The halcyon looks like the very standard cage design. I know that the DSS OPV kit can replace the newer halcyon OPVs. I’ve got the...

Letting a playlist of dive videos roll on my side monitor while I count down the days until I can get back in the water, and this one came up. Some incredible footage of a cave in Mexico. I'm wondering if anyone can shed any light on what the third 'stage' bottle/tube is the diver is carrying...

I'm hoping to put together a bp/w rig with a little flair. Anybody know of an online source where I could order 10+ continuous feet of standard 2" nylon harness webbing in various color options? I found one supplier, but it looked more like it had the silky seatbelt finish from the pictures, and...

Looking at most agencies standards, there are stage/multi-stage as well as technical cave certs following Full Cave. How does this advanced curriculum fit within GUE Cave training? I understand that C2 is roughly equivalent to full cave plus a single stage. Now that GUE has eliminated C3 from...