Deadly heat waves have struck Greece, leading to the deaths of several tourists and the disappearance of others on Greek islands. The extreme temperatures have caused hikers to become disoriented, with some missing individuals found dead and others still unaccounted for. The heat wave, with temperatures exceeding 100 degrees Fahrenheit, has prompted authorities to issue warnings, but there are no restrictions on activities like hiking. The challenging conditions have led to tragic outcomes, including the deaths of tourists and the ongoing search for missing individuals.