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How do you possibly get into an overhead without noticing it? Sure, a very bad dive briefing may not mention a cavern, but you do not have to enter it!1) Surprise dark or silted overheads that didn't come up on the dive briefing for an "open water" dive
I do not have a video camera (or any underwater camera for that matter), but I can relate to this. Pretty much the only thing underwater that gives me the willies is having no solid reference points. When you are in mid-water and cannot see the bottom, and it is all featureless green murk in all directions... I get really uncomfortable. What I am mostly scared of is the idea I might ascend uncontrollably, and not even realize it is happening. On few occasions I experienced such "green space" (or worse, "black space"), my eyes were glued to depth gauge. Not fun.2) Taking video of a giant manta, then turning around to see that I had lost all reference to anything around me, except for some vague shadows in the distance, and seeing that the 45' viewing point where I was watching said manta with a group of divers had become 90', and I was all alone. Manta hypnosis ... my bad.
I would say your fear at that point was entirely rational. Good lesson as to why not to attempt penetration without proper training/equipment.I remember solo diving on the Shinkoku Maru in Truk Lagoon. Bloody big boat. I mean really bloody big.
Anyhow, I am ambling around the deck and there is a hatch, which is open. I don't have a reel, but I figure I pop in and go down a few feet. I shine my light in every direction. I can see nothing except the deck above me that the hatch is on. Just blackness in every other direction. I go back up and check that the hatch is solidly stuck open with coral growth. No chance of getting locked in. I decide to go back into the hatch and descend to the bottom of the hold. The water is crystal clear, and I figure I can always see the hatch as it will be this bright blue light above me.
So in I go and I descend. Ten feet. Twenty. Thirty. Forty. At fifty I stop. I shine my light in every direction. Still nothing can I see in any direction. That hatch with the blue light coming in is looking awfully small. For no rational reason I can fathom I suddenly became very afraid.
1. One of my biggest fears that gave me the willies was getting sick underwater and having to throw up in my reg. I didn't know if I could really do it without choking. I now have quite a bit of experience puking into my reg....UGH....not that I like to, but it sure makes me feel better when I do.
2. Another thing that gives me the willies is being on a night dive and having another boat (or ten) drop their divers right where our group is located. Talk about confusion and wondering if I'll ever find my dive buddy and group! We finally bought the light (looks like a Christmas tree bulb) that attaches onto the tank so my buddy and I can easily see each other.
3. Having to climb up the ladder in rough seas strikes terror into my heart. I've done it, but I don't like it!
4. This has never happened and I hope it won't.....don't laugh....having to go #2 while in a full wetsuit while underwater.