3 Fishermen Vanish Off Oahu Their overturned boat was found Monday By Arden Dier, Newser Staff Posted Jul 5, 2016 6:56 AM CDT Updated Jul 5, 2016 8:11 AM CDT 7 comments Comments A US Navy ship is seen off Haleiwa, Hawaii, in January. (Craig T. Kojima/Honolulu Star-Advertiser via AP) (Newser) – The Coast Guard is searching for three men whose fishing boat overturned off Oahu's North Shore. Authorities say Jensen Loo, Clint Oshima, and Derek Tomas—all aged 30—left Haleiwa around 5:45am Sunday and were to return by 5pm. The Coast Guard was alerted when the men still weren't back by 8:30pm, and on Monday their 20-foot fishing boat was found overturned 25 miles off Haleiwa, reports Hawaii News Now. Officials say a rescue swimmer searched the vessel but found no one on board. A helicopter, plane, and patrol boat are now searching with firefighters and the Navy, per the Honolulu Star-Advertiser. A friend says it's "surprising" the men are missing because they're avid fishermen. However, other fishermen say ocean conditions were rough and windy Sunday. "The seas are a little rough, especially out that far," says a Coast Guard rep. "Right now the visibility is great, so we're doing everything we can out there. We want to find them as soon as possible because if not, the search pattern just keeps getting bigger and bigger." Three boaters had to be rescued when their vessel capsized while towing the overturned boat, and another swam to shore, according to a release. One is now being treated for hypothermia.