LOL, I spent a long time getting that crap off my Meg the other day! You gotta do Waterhole, it's one of my fave tunnels in Peacock, holler at me if you need a buddy.... :)
Safe diving,
Rich
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For what it is worth, my advice is that if you swim to Waterhole III from PI that you don't bother to surface. Get to the big rock at the bottom of the cavern, look up, and turn the dive. Above only lies a tangle of logs and poor visibility. The tunnel to get there is beautiful, the basin is ugly. Kind of like Cisteen, but not as scenic.
I have only been there once, a month ago. I wish I had known then what I know now.
I guess the visibility can improve in the future, but the tangle of logs is not likely to change much.
Can I dive this tunnel in backmount or is it a sidemount tunnel?
It's more than sufficiently open for BM.
The dive from P1 to Waterhole III is a out 45-50 minutes and it takes about the same time to return.
The jump is the first marked jump to the left in the peanut tunnel and IIRC is about p. 900'. There is a slight restriction about 200' or so down the Waterhole tunnel at the top of a small rise, but it's easily negotiated in backmount with no contact if you roll slightly to the left.
There is a slight duckunder at about 550'-600' from the jump immediately past the line to the sidemount tunnel (I suspect most people don't notice that line) that leads back to the peanut line at about p. 800. That is the location that seems to collect the most handprints in the bottom so while it is not all that tight, some divers seem to have skills issues and bottom out there.
Prior to that point the tunnel is fairly wide and low, while past that point it has a much more vertical relief and you may find some low pockets of tannic water along the bottom of the tunnel in a couple spots. The entire tunnel is quite pretty.
A fairly large rock fell on the line just short of Waterhole III about a year and a half ago and as Mark states that is not a bad place to turn the dive. If you go up, it's not all that bad - somewhat Cisteen like in terms of logs, and duckweed. Be sure to run a line but in general the viz is not bad under the duckweed and it stays ok if you stand on a log during the SI and do not stir it up. Getting in however pretty much guarentees blown vis in the sink and I've never seen an upside to doing that.
Word on the street says there will likely be an article on hydrilla in one of the upcoming CDS magazines for anyone looking for more info. I hear the photos are absolutely superb.