Mysteries in Lake Iliamna

Of seals and monsters
Lake Iliamna has a seal population estimated at 280.  Where do they go when the lake freezes over? Alaska Natives think they must have a cave somewhere. Others think they swim out via the Kvichak River.  This naturally leads to speculating about the lake's other large inhabitant - the "Lake Iliamna monster." Probably an undocumented species of sturgeon, but we don't know, and one man is even planning a deepwater camera experiment to find out whether it might be a sleeper shark instead (my opinion: No).  If I had to bet money, though, I  would say that some large fish exists here behind the monster legends and sightings.