Cmon! Most raft anchors are maybe 15-20' deep...if its an old lake thats been swum in for a while...all sorts of loot around that spot! Certainly a bit of danger, but hey, almost everything we do has that in it to some degee! Cant be any higher danger than hunting an urban park,
Besides, its warmer under the ice than above it, a guy could really work an entire lake all winter long in peace and quiet!
Nobody running over you with a boat, no jet skis out, nobody knowing what you are doing except thinking you are fishing! Heck, you drop an anchor, caribiner yourself to the line, slide on down and start working an ever expanding circle, use enough weight and you dont even need fins! Once the mud stirs up, it will be complete and utter darkness though...
I guess a guy could also put a line of lightsticks up top under the ice to outline the hole, and maybe a few strings of them on the bottom for reference points......anyway, it would be an easy way to work a lake I would think... you would have to worry about your regulator icing up and whatnot...yes it would suck if something went awry....if you got unhooked from your main line for instance....but at least somebody else will have an adventure finding your carcass, as far as a death goes, it would be outside the conventional, and it would make a cool story for the widow to tell...so theres that.
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Mud .