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look for books, CD's. etc used on amazon. Neatnicks threw some of mine out, Marie Kondo is the devil. Replaced for about $8US shipped to my door.

Make sure dad has a personal PFD on big enough to float him head up regardless of any chair device.

For the price of the Deep6 regs, you could buy new ones when needed, and sell the old ones on ebay.

Mr. Octopus is Canadian. His Canucks sweater is in the wash, tis why he's out and about playing with cups and shells.

DGX Bolt Kit for Single Tank Adapters | Dive Gear Express®

I always bring a weight belt. Rolls up small, cost is small.

Try to find a good instructor, then ask about private instruction. It might not cost much more than a class. It helps if you are a quick learner of the written stuff i.e. gas laws, physics, that stuff. The 2 of you get to work out the schedule, like pool sessions at 5am.

My guess would be Cressi adjusts the oxygen percentage as a way to account for errors in the measurement given by the depth sensor and / or errors in the gas mix. 0.8 / 32 is 2.5%. This would be safe real world engineering versus the exact numbers in the model.

The times I dove Molokini were awesome. The weather was great, as was the boat and the crew. Kona coffee, fresh pineapple, whales everywhere, it was awesome. One thing I remember was almost nobody paid any real attention to the dive briefings. I'll bet half the divers didn't realize the back...

O2% + 0.8 ?

Sounds like lawyers / liability insurance is going to force every diver to have AOW to go below a legal hard bottom of 60 feet.

Tennessee is a sleeper. Shhh ... don't tell

Benchmade 8 is nice, good quality trauma shears as well.

I had some silicone swim goggles (major brand but not Speedo or Arena) that always oozed a tiny bit of something from the silicone onto the lenses. I never could keep them from fogging.

Well I'm not a boater but if I thought someone might be in distress I would check it out by motoring to a spot a safe bit away from them to the deep water side where I could stop and take a look. I don't think I would aim right at them with my screws turning.

Saw this on BBC Coral dredging: 'It's going to cause irreversible damage'

I think what would hurt a reckless boat driver the most would be for a judge to ban the boat from sailing for a long time. Owner may have payments, slip fees, insurance, etc. but the SS Minnow isn't going anywhere for 1, 5, 10+ years. Slap a temporary lien on the boat for 10x it's value so it...

Naval Architect note: Replace flybridge with a humvee turret sporting a Mk19 40mm grenade launcher.

Muscle fibers doing any work use O2. Relax as much as possible, use as few muscles as you possibly can. Use your arms as little as possible. Any anxiety causes muscular tension, burns O2. You probably have 3-4 times as much muscle as a 100lb woman, you prob can't compete with her in air...