Mario Fialho, 41, was aboard a 23-foot boat named the Dad Sea Cave on a recreational fishing trip that left Sandwich Marina, Massachusetts, the morning of November 8, 2016. He was with Carlos and Dylan Amaral; the small convoy of three boats headed across Cape Cod Bay toward Race Point and fished for much of the day. Weather and sea conditions were not reported as unusually hazardous.

About 2:00 PM, two boats that had been fishing nearby began their return to Sandwich and discovered the Dad Sea Cave was missing. By 7:00 PM a friend reported the three men missing; their truck and trailer remained at the marina. The Coast Guard mounted a multi-day, multi-agency search from Sandwich to Provincetown that covered thousands of nautical miles. An oil slick off Provincetown was checked but produced no connection to the vessel, and the Coast Guard later suspended active searching.

The three men have not been found and the disappearance remains unresolved. If anyone saw the Dad Sea Cave or the men on November 8, 2016, or has information about their movements that day, please come forward.