Diver base jumps largest underwater sinkhole

There is such a thing as a bounce dive. This is where you go directly down to say 300' and the come right back up. No safety stops. Crazy stuff

 

Neat video. It's not the largest underwater sinkhole though. It is the second deepest with Zacaton (off Mexico) being the deepest and I think the 'great blue hole' off Belize is the widest.

 

How does someone sink like that? lol
I need weights whenever I go snorkeling. My beer belly keeps me afloat lol.
Very cool video indeed. but it does take a lot of guts to dive into a black hole in the ocean. Killer squids, sharks... Need I say more.

 

Even though this was obliviously edited, as mentioned, it's still really cool. With editing, you can get the better views of the diver anyways. The sinking part was sweet how he just fell straight down. With the use of editing & an artist, I think it ads to the effect. Would seem nearly as cool if it was all one shot, just following behind him with a camera. Neat vid. That's some crazy stuff.

 

wanna see something real crazy check out the video of the world record for free diving. I heard she died after setting the record

 

Wow, that is crazy. Kinda sad that someone would care so much about something, to risk their life to do it.

 

I think it was like 300+ feet... free diving!

 

I can't agree with that. I see it opposite to be honest.

 

That's your opinion, I know. But I mean like to make a world record or "meaningless" ? Not that to some people that isn't important. But I mean, so the lady went down to the bottom of a hole & she's the best...not any more. Now she's dead, so what does that mean? If the thing a person cared oh,so much about was to help an injured person, I understand.

 

Good answers to the bends question. Another reason freedivers don't get the bends is because of the time spent on the bottom is negligible. The bends is a malady where nitrogen comes out of solution in the blood, and in joints. Another component that may or may not happen might be rupturing of the lungs. As =Jwin= and Telgar said, if you take the breath at the surface and hold it, then dive to 100', it compresses with your lungs. No issues there, even if you hold your breath until you're almost to the top.

The major limiting factor in SCUBA diving is bottom time. As you breathe from a compressed air tank at depth, the nitrogen gas goes into solution in your blood. The longer you're down there, the more your blood becomes saturated with gasses. The workaround is 3fold--you must ascend no faster than 1'/second. This rate allows the nitrogen to come out of the blood slowly enough where it's expelled through the lungs. Also, using equasions (Navy tables) based on bottom time and duration, you might have to stop during your ascent at various depths for specified periods of time to "offgas." Finally, you always breathe!

The analogy that was brought up in my SCUBA certification is the can of soda. All that CO2 is in solution when the top is unbroken. In this analogy, that's your blood. When the can is opened, it becomes fizzy, but not before. That's the equivalent of gasses coming out of solution. If you shake the can and open it, well, you know what happens. That's what happens with the bends, either you've exceeded your bottom time, ascended too quickly, or didn't make the appropriate number of decompression stops at the proper depths on the way up. The gasses that were small enough to be liquid at depth, will form bubbles and if bad enough, will kill you. The only remedy for decompression sickness is a hyperbaric chamber. It looks like a pressure cooker/bank vault contraption that you sit in, and by controlling air pressure, the operator outside of the machine "takes you back down to depth," and brings you up gradually. They're probably more common now, but when I was certified in 1992, there were only a few of these chambers in the USA.

Incidentally, if the diver in the video had an O2 bottle (which I didn't notice) he could have taken a few deep breaths on the bottom before ascending as long as he breathed out the whole way up.

Every 33' of water depth is equvalent to the pressure exerted at sea level. (14.7 lbs/sq.ft.) So at 500', the compressible components of your body (lungs, mainly) would be about 15 times smaller. Imagine your lungs approximately the size of golf balls! The "always breathe" rule is paramount in SCUBA. I've always got a kick out of the duration of the exhale on the way up. If you took a deep breath at 100', and began a descent, that one exhalation could take almost a minute, and your lungs would still feel like you had plenty of air left in them.

And about the video, the folks who made it know their stuff about making movies. The camera angles, use of light, and synchronization of music was top notch.

Thanks for that, Matt!


EDIT: and to Siddique, you DO needs weights to descend quickly. The man in the video had a weight belt with a single lead piece in the small of his back.