Sept. 25 (UPI) -- After crews scoured trails and shorelines in the Shoshone Lake area of Yellowstone National Park, a search for a missing man has turned into a recovery operation, the park officials said.
The search was triggered after a family member reported Sept. 19 that Mark O'Neill, 67, and his half-brother, Kim Crumbo, 74, were overdue from a four-night backcountry canoe to Shoshone Lake in Yellowstone National Park.
Earlier in the week, rescue crews located the body of O'Neill, of Chimacum, Wash., along the east shore of Shoshone Lake. Rescue crews spent five days looking for Crumbo, of Ogden, Utah, by foot, boat and helicopter.
The National Park Service said Friday it would begin using sonar equipment to look for signs of Crumbo in the water. Recovery efforts were expected to continue for the next several days as conditions allow.