They should be able to help make arrangements for transportation back to the United States or to the nearest major medical facility, but you'll be responsible for payment up-front. Be Prepared To Pay Haggling over price is fine when you're shopping at the local straw market, but not when you're bleeding at the emergency clinic. Have a plan to pay for medical care that doesn't rely on whipping out your HMO or primary insurance card. Your policy may not cover overseas expenses. Read the fine print.
Coverage varies from company to company, even policy to policy.
If you talk to a company representative, get all promises to pay in writing. Older divers should also be aware that Medicare insurance won't cover any medical expenses or hospital costs incurred outside of the United States. Even if your insurance coverage does travel with you, the local clinic or hospital might not accept it. Most will demand payment up-front. Examine the bill.