Rebreathers and Sharks

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TravelDive

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Location
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200 - 499
I was very surprised when I started diving with Sharks after moving from OC how close them came, infact it gave me a good dose of the fear. I was unprepared for the Sharks more inquisitve behaviour due to the lack of bubbles. Has anyone else experience this as well? I was filming the sharks, the combination of electronic signals and my racing heart rate + no bubbles lead to some hair raising moments for me.

I put this down to the Rebreather since sharks are normally very distant when I have dived OC!
 
I was very surprised when I started diving with Sharks after moving from OC how close them came, infact it gave me a good dose of the fear. I was unprepared for the Sharks more inquisitve behaviour due to the lack of bubbles. Has anyone else experience this as well? I was filming the sharks, the combination of electronic signals and my racing heart rate + no bubbles lead to some hair raising moments for me.

I put this down to the Rebreather since sharks are normally very distant when I have dived OC!



Hello TD, yes I have the same experience. Sharks become either more curious or a bit more aggressive towards me when I am diving CCR, more so even, I believe than when I dived SCR. I have had many big sharks come in for a good long look at me as I think they are curious what kind of big fish is in their territory. I can hear OC divers blowing bubbles before I see them, so imagine how far away a shark can detect a bunch of OC divers. I have seen some 6-7ft grey reefs in places like Ambergrize Caye in Belize, where nobody had seen one in years. I saw one at the beginning of almost every dive there, also saw an equally rare very large, very old turtle there too.

The effect is even more pronounced in remote places like Papua New Guinea. I once dived on a seamount way out in Milne Bay where on a single dive, I saw several hammers, a big silvertip, many grey reefs, a 12ft sand tiger and a HUGE 15ft+ oceanic manta. Oh, and there were 10 other CCR divers in the water, try to imagine a similar result with 10 OC divers on a site. My avatar picture was taken at the end of that dive, also had killer viz, probably my favorite dive ever.

I have been bumped, circled and otherwise menaced by sharks in a variety of ways. But I am convinced they mean mostly to test you to see if you are a threat. If you maintain a proper, submissive posture towards them and avoid direct eye contact, they almost always move on. Some photographers wind up provoking shark bumps due to their head forward posture and probably also because of the protruding camera and bright flash.

Of course all bets are off if there are large numbers of them, in which case they, grey reefs in particular, behave very, very aggressively. And some conditions are probably too risky to manage. I have been chased out of the water by a very aggressive grey reef on a solo night dive in Northern PNG. I would not recommend solo CCR night dives in sharky places, 2 divers minimum for me to do a CCR night dive in any place near deep water. There is always strength in numbers when diving with sharks as they are ambush predators and always looking for an advantage. In some parts of the world night dives of any kind are prohibited, like the Galapagos. Much as love sharks, I would hate to encounter a big Galapagos shark at night on CCR by myself.

Mostly, CCR has allowed me to blend in more with the scenery and thus camouflaged, I can watch fish behaving more naturally than say at a scheduled shark feed. Getting closer to sharks and other big fish was one of the main reasons I decided to move to CCR and I certainly have not been disappointed... -Andy
 
I too have had a lot more "close encounters" with sharks. As I explain to those asking about my RB, the good news is you don't scare away the fish, the bad news is you don't scare away the fish. I've had to up my knowledge of various animals and their behavior patterns to compensate. All that said, I have not really had too much concern, yes I get a lot more photo opportunties, but concern for my safety really has not been a big deal. If I think their being a bit to inquisitive, I just exhale through my nose. I figure it works for other animals as a warning to back off, so far its worked pretty good. Remember though don't turn and swim a way from the bigger predators, that is asking for a bit of trouble.
 
I'm on open circuit here with a paralenz bolted to my head and not in a tank but in the ocean is that the same

Screenshot (1325).png
 
I dive OC too & heard about some sharks are scared of bubbles & our Darth Vader breathing sounds. So, when I was hunkered down on rocks in Hammerhead cleaning station in Cocos & Galapagos, I would hold my breath for a few seconds when the sharks were approaching me and I was able to video them swimming right above my head to the point of I could have been able to reach out and touch them, if I wanted to, as shown in the following video:

 
Thank you. Really interested to hear specically from folk diving rebreathers and shark encounter behaviour

Yes they are much more curious and bold. I can tell you that often they disappear when I start hearing OC divers. I often get as close to sharks on rebreather when I’m by myself as I used to get on baited divers.
 
During Mod 1 we had a wide circle of five of us hovering above the sand in Key Largo doing drills. A smallish reef shark (~7') came over and circled at a distance. Then it circled again closer. On the third circuit it made a right turn and entered the circle between two of the divers, crossing straight into the middle and leisurely heading directly at me.
Now out of my comfort zone with this move, I exhaled a burst of bubbles with loose lips on the DPV when it was about 6 feet from me. Boom! It was gone faster than I could see.
 
During Mod 1 we had a wide circle of five of us hovering above the sand in Key Largo doing drills. A smallish reef shark (~7') came over and circled at a distance. Then it circled again closer. On the third circuit it made a right turn and entered the circle between two of the divers, crossing straight into the middle and leisurely heading directly at me.
Now out of my comfort zone with this move, I exhaled a burst of bubbles with loose lips on the DPV when it was about 6 feet from me. Boom! It was gone faster than I could see.
im really interested to observe behaviours like this. Just bought my first rebreather today so i guess ill be finding out soon 🙂
 

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