Using the ice as an easy solution to placement of the mooring block makes a lot of sense. As to the safety issue, I would think that a suitable flag or similar very visible indicator could be placed atop the block to warn sledders of a hazard. The flag could be mounted on a heavy wood block, such as a piece of 4x8 or LVL, and attached to either the mooring block or shore by a light cord, to remain afloat after the block sinks to enable retrieval. Hazards such as rocks poking up through the ice in shallow areas (and shorelines as well) are out there anyway, and sledders always have to be aware of what appears in their headlights. There is no absolute protection against harm from lack of caution or recklessness.
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