"It helps us sleep at night," says Yamit Avital. In the turquoise waters of the Red Sea, Avital is one of many survivors of the Nir Oz kibbutz to take up freediving -- a sport that involves holding one's breath and plunging deep beneath water for extended periods of time. Many say they find it to be a meditative exercise that helps assuage their trauma.. "At the end of the day, to feel that, to know what it is, to go back to the surface and take a breath of fresh air, is something very therapeutic, very healing," says Yamit Avital. IMAGES AND SOUNDBITES