He turned back south , alone and without any food or water , and made it to a watering - hole called Tarra .
But two days into the Sahara , Houghton feared that his travelling companions intended to kill him .
Houghton turned back south , alone and without any food or water , and made it to a watering - hole called Tarra .
But two days into the Sahara , Houghton feared that his travelling companions intended to kill him .