Two people plunged into the water on Lake Kegonsa Saturday morning when their ATV broke through "bad ice," an official said. Dane County dispatch said crews responded to a report at about 7:20 a.m. that someone had fallen through the ice on Lake Kegonsa at Fish Camp County Park near McFarland. The Madison Fire Department said crews from McFarland, Monona, Madison and Stoughton were dispatched to east of Colladay Point on the lake. Officials said in a news release that two people were riding an ATV on the lake to go fishing when it fell through thin ice and sank, and the two people fell into the frigid water. One of the fishers had a medical alert pendant that was used to call for help.