Vladimir Horak, 63, disappeared while on vacation in Kauai on April 28, 2011. He was part of a tour group exploring the Hanakapiai area and went swimming shortly before 1:00 p.m.

A two-day search of the coastline and surrounding waters was conducted but turned up no sign of Horak. The search was called off and he is presumed to have drowned in the powerful Pacific currents. The disappearance is classified as a lost or injured missing person case.

Does anyone have personal knowledge of that day on Hanakapiai or information that could clarify what happened to Horak?