Monte Bolton, 27, disappeared on January 4, 1992, while exploring Anacapa Island in the Channel Islands National Park with his 21-year-old brother, Bryan. The brothers had taken an eight-foot dinghy to investigate sea caves; that dinghy was later found full of water. Bryan’s body was recovered inside a cave about 24 hours after the pair were reported missing, but Monte’s body was never found and he is presumed to have drowned.

The visit had been a holiday trip to see family, and search efforts failed to recover Monte or determine exactly what happened in the caves that day. The case remains open and unresolved.

If anyone was on or near Anacapa Island on January 4, 1992, or has information about the brothers’ trip or the dinghy, please share what is known.