When you say “murky” what do you mean?
If the water was brownish, that’s suspended mud sediments. In that case, as mentioned elsewhere in the thread, the ice might have prevented wind from stirring the water and stirring up the mud.
If the water was a pea green, then that’s suspended single-celled algae. Freezing over the pond killed the algae…either the temperature got too low or the ice cut off light from the pond (especially if snow fell on the ice).
If the water was covered by hairlike green algae and other miscellaneous scum, that’s drifting multicellular algae (and possibly some plants like duckweed). Freezing killed them off, they sank to the bottom, and now you can see into the pond.
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