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I’m going to venture an educated guess on this apparatus. Take the wire, and place it inside the rubber cone, with the long end pointed up. The pingpong ball would be a float, which would swing that arm down when in air, but would float it up in water. The rubber (weighted???) stopper would...

Lockchart, You’ve got to analyze this dive a bit differently. First, why was the mask off and regulator spit out? Those two need to stay in place. If the mask knocked off you by the chop, then that is an issue to be addressed. The regulator is the same, keep it in your mouth. It provides...

Here is one paper that showed the U.S. Navy has experimented with its divers and how they react physiologically to high noise underwater...

I think this whole concept of a “solo course” is pretty funny. But be aware that I started solo diving when I started diving in 1959, as a 14 year-old boy. There simply were no other divers around most of the time. We started the Salem (Oregon) Junior Aqua Club, associated with the Salem Aqua...

I wear a helmet. SeaRat

I usually switch to my snorkel on the surface, immediately. If you do that, especially with the snorkels now that they don’t really allow water into the mouth of the diver, this could be prevented too. SeaRat

I'd both welcome you here, and urge you to post it into the Neal Misses & Lessons Learned forum above. We have a lot of information there, and if it were posted here it might just get lost. John (SeaRat)

The interesting thing about the MR-12 is that, unlike the Aquarius, it is a balanced diaphragm first stage. Now a balanced diaphragm first stage always has some spring pressure on the seat, even when unpressurized. This is unlike the piston regulators (Aquarius, Scubair series, etc.) which...

Go to Goodwill, and look over their snorkels. People buy these fancy snorkels for their vacation, then come back and donate them. A lot of times you can get a snorkel for under $2. Take a measurement of your Scubair J’s exhaust, and compare to the various snorkels you will see at Goodwill...

Okay, I’m going to jump in here. If it were mine, I doubt I’d be looking for a “rebuild kit” for this regulator. The first stage has two moving parts, the piston and the spring. Neither needs replacing. The sealing is done by 3 O-rings, which probably can be reconditioned with some silicone...

Well, you can see that I like my double hose regulators low on the back, like Nemrod states: Subtidal Clambed Survey006 by John Ratliff, on Flickr Here’s where I like my double hose regulators on my twins. This one has a Scubapro valve, which can be “twisted” a but, but it is not necessary on...

I have owned my Trieste II since the late 1970s. I have analyzed it a lot over the years, and it has undergone several revisions. The original Trieste II, out of the box new, had three major design flaws that made it harder to breathe than it should have been. 1. The main LP diaphragm was...

Tourism in Maui is growing now, and they could use seeing you there. I'd go to Maui, maybe not directly into Lahaina, but go to help Maui out. Maui is my favorite warm-water place too. SeaRat

I don't think I ever had a "midlife crisis," but probably that had to do with continuing to dive. I'm approaching 78 years old, and have been retired for over ten years now. Diving has been an activity I've done since 1959, when I first started diving. I just never stopped. I feel that a...

I learned a lot of physics and physiology as a kid by studying diving. Diving provides a real-world example of some of these physics concepts that even a kid like me could understand. I read Cousteau’s The Silent World three times as a kid, 3 years before any really, formal training in diving...

Okay, I’m going to add a few complications, because it is applicable to all divers. First, about pressure. We need to understand the units of the pressure. In U.S. units, that is PSI, or Pounds Per Square Inch. It doesn’t matter how large the surface area is, the pressure in PSI will be the...

There are a few problems with your statement. First, you are never "out of air" because you have a residual volume in your lungs. If you look at the diagram below, you have a expiratory reserve volume of at least one liter of air. Let's say you are ascending from 132 feet. That's five...

Seaweed Doc, yes, you are correct. I just found a my files from my M.S.P.H. degree studies, and one by Douglas A. Swift, M.D., M.S.P.H., a PowerPoint presentation titled "Occupational Pulmonary Disease," contained this slide picture of the alveolus and blood capillary interface which further...

I put a “sadness” emoji onto your post, as my Mom died of lung cancer and emphysema caused by smoking in her late 70s. My grandma, on her side, lived into her 90s. I know you were posting this somewhat in jest, but for me it isn’t funny. SeaRat

For those still skeptical about the mechanism of pulmonary barotrauma contributing air to the arterial system, I just found some of the PPT slides from my Tulane University course in Occupational Pulmonary Disease from Douglas A. Swift, M.D., M.S.P.H. This particular slide shows the...