Welland ,Ontario canada, just north of Niagara fallshttps://www.youtube.com/watch?v=6pZOvvPezT0&feature=share&fbclid=IwAR37UHMe-K6MrdNnQp6c_HA_pd4_cYJLgbvmdQqDfKKikPPEoo4ojHfOaKc
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looks like no lines laid,
If they were using cave protocol then nobody would have been tied off and there would not have been a line tender.where did you get this information ?
edit: it may be safe to assume if the divers were separated and one did not make it back, he may not have been tied off, and may not have had any line tender. "if" that turns out to be the case, this would be a sad waste of a life for no reason.
RIP
It’s a Scuba Park in a disused canal that has one end sealed off so there is no current I have noticed in ten years of diving there. Unlike a lake where the ice can indeed not be fast to the shore, and drift around later in the season, in the video I’ve seen the ice looks to be fast to one shore.It looks like they did an open water entry from shore and then moved under the ice or the ice moved over them and they could not get out.
At home we ice dive, but with tender, rescue divers etc ready to go. As the ice goes out no diving until the floating ice is at least just slush if not totally gone. A shift in wind, or in the canal a shift of the ice can turn an open water dive into a covered overhead dive where you have no idea where or how far away your exit point is.