Ruben A. Saenz, 31, of Encinitas, California, was last seen on June 21, 1989, in the Kalalau area of Kauai. Described as quiet, religious and environmentally minded, he had traveled to Hawaii seeking personal insight and was camping in the rugged Kalalau Valley on the Na Pali Coast when he vanished.

Searches of the dense foliage and steep cliffs turned up no sign of Ruben or his belongings. In 1991 a Hanalei store owner reported seeing someone who matched his description, which gave the family hope that he might be alive and living off the grid, but that sighting was never verified. No confirmed contact or physical evidence has emerged and his whereabouts remain unknown.

Did anyone who visited Kalalau or Hanalei around 1989–1991 have information about a camper named Ruben Saenz or recall that unconfirmed sighting?