>The continent, or moderate, ileostomy is a loop of small bowel fashioned under the skin with a nipple valve to prevent spillage. Ileal effluent collects in this reservoir, which must be emptied with a soft rubber catheter. The second type opens directly onto the abdomen, requiring an external ileostomy or colostomy appliance.
>The direct type of ileostomy and colostomy poses no danger to the diver. Ensuring a secure fit of the external bag can prevent spillage of fecal material. A continent ileostomy poses theoretical risk if gas swallowed during the dive cannot escape through the ileostomy site.
>For one with continent ostomy, an gastroenterologist or surgeon should make an individual assessment.