Kevrumbo
Banned
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(posted in another thread):Sorry for posting here, since I'm not a tech diver, but I wanted to bump what boulderjohn just said. When I read the OP my first thought was, what about just deco diving? That's tech, can be done in shallower water, and doesn't cost an arm and a leg. Hell, NDL at 130' on air is only 5 or 6 minutes, but you could do a longer dive with some decompression obligation, and really get to look around at stuff.
It's not elite diving, but I think could still be very rewarding. Again, not a tech diver, but seems reasonable to me.
Drifting deco is fun when you've got clear water next to a deep reef wall with abundant big fish & pelagic action to see, in tropical warm waters and hearing the dive skiff/boat crew above clearly tracking your SMB.
Not so in murky cold waters; in the shipping lanes to major ports like Singapore or Los Angeles/Long Beach; or off east coast Sri Lanka (WWII aircraft carrier HMS Hermes) Bay of Bengal/Indian Ocean where the next landmass after Diego Garcia is Antarctica. IOW, you get your SMB up from depth ASAP by at least your 50% stop at 21 meters, and concentrate on keeping it upright so your surface crew can track you. . . (and hope you don't get run over by container ships & supertankers).