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This looks like a star coral, but the color is weird. There were many of these "blue corals", especially to the south of St George.

That is, rated for 50-80, 80-110, or 110-140 Psi? Too low will go into free flow, and too high won't give air, right?

I found it here.

The manual has a quiz that asks the students this question in Chapter 3: "What are the 2 main modes of operation of a dive computer?" The correct answer is 1. Surface mode 2. Decompression mode. I am puzzled, what do these answers mean. If I am diving a normal NDL dive, in what mode is my comp...

One fish and one...I can't even guess where it belongs. Maybe one inch long.

1. Will a single J&J shot be OK? This is a single-shot vaccine. 2. Will 2 shots of Pfizer w/o booster be OK? This is a 2-shot vaccine.

Maybe 2 inch long, at Blue Heron Bridge this Friday evening. My guess is, a baby batfish?

At Boynton Beach reefs, on the sand next to the ledge at about 55 ft. Did not seem to be attached. Rather large, maybe 1.5 ft across. A large jellyfish? But I could not ID.

There were many of these on sandy flats off Bimini at 30-40 ft. They look like a cut-off top of a plastic bottle with a diagonal cut across, so they are not circular. Soft and easily broken. Someone tried to lift this thing on board but it broke into pieces.

It is so old and covered with barnacles I am hesitant to name it.

A few reef sharks that used to be very common and abundant, and are particularly popular among divers, are now threatened. This includes the Caribbean reef shark (Carcharhinus perezi) reclassified from Near Threatened to Endangered, lemon shark (Negaprion brevirostris) from Near Threatened to...

I find this paper interesting. They used DNA fingerprinting to ID the remnants in the stomachs of 50 Lionfish from Sarasota area taken in 2016, and turned out that LF mostly consumed small gobies (2 species, 44.7% of the prey by numbers found), Sand Divers (16.3%), Sand Perch (14.3%), and Bridle...

...firing a powerful underwater flash can break the radio connection between a dive computer and a separate pressure sensor. It can, concerningly, cause the dive computer to crash. Has anyone experienced something like this?

Is Corridor Wreck Track good for this purpose or do I have to look for something else? 6 wrecks in, say, 45 min seems too fast for me.

1. Peanut Island: snorkeling only or also some diving? 2. Google maps shows me 2 artificial reefs just North of BHB opposite SingerDr/Bimini Ln area called Sugar Sands Ledges and Sugar Sands Rock Pile. What are these? Has anyone tried? Thanks!

I've checked some LOB routes, and some of them go north from Sorong, and some go south. Can anyone compare the quality of reefs or comment if there's any difference in what you see underwater? Wasai/Kri area vs Misool?

1. Mantis or False Mantis? 2. 3 feet away from this shrimp there was a "tapir" looking out from his hole. The only fish with a face like this in my old Humann & Deloach book is Blackspotted Eel, but it has not been reported in Florida. Just south of Blue Heron Bridge.

I got this belt as a gift from a guy in Sevastopol in 1975 and found it digging through my Dad's junk. I used it for freediving only. It has a stainless steel quick-release buckle. The belt itself is nylon.

Got this kit in 2016, occasionally used, never flooded. I liked it but I switched to A6000 and only used this Canon kit couple times in 2018. No original packaging but I have printed manual for the camera, battery charger and 1 battery. The waterproof case has both the handband and the yellow...

During this one dive in Keauhou Bay, I found 2 snorkels, a fishing rod, couple of sinkers, and this battery. I'd say that intentional disposal of snorkeling and fishing gear into the sea is highly unlikely, but what about the battery? This was not the 1st one I ever found while diving, and not...