John Gyurtsak, 74, of Big Pine Key, Florida, was last seen on November 4, 2019 when he left on his 34-foot pleasure craft Thermocline sometime before 2 p.m. He was expected to meet a friend the next morning and failed to appear. The boat was later located anchored about one mile south of Big Pine Key with its engine running, but Gyurtsak himself was not aboard.

A multi-agency search involving the U.S. Coast Guard, Florida Fish and Wildlife Conservation Commission, the Monroe County Sheriff’s Office and U.S. Navy helicopter crews covered roughly 2,280 square miles over about 62 hours. The Coast Guard suspended the search on November 8, 2019 after finding no sign of him. The circumstances of his disappearance remain unclear and the case is unsolved.

Did anyone in the area on November 4, 2019 see Thermocline or notice anything unusual that day?