Some travel insurance policies exclude hazardous sports including diving while others include it with restrictions or limitations (i.e. must hold an open water dive certificate, be accompanied by a dive master and not dive deeper than 130 feet). In addition, some international travel medical policies have an optional hazardous sports rider which will cover medical emergencies while diving. I would encourage divers to select a travel insurance that will provide them with the cover required for any unpredictable accidents or Decompression sickness.