The British Indian Ocean Territory is a British Overseas Territory. It is administered from London and there is no British diplomatic or consular representation there.
The British Indian Ocean Territory is not a tourist destination. Access is restricted and a permit is required in advance of travel. There are no commercial flights and permits are only issued to yachts in safe passage. Access to Diego Garcia is only permitted to those with connections to the military facility. See Entry Requirements.
There is a low threat from terrorism. See Terrorism.
There are no medical facilities in the territory. Search and rescue facilities are limited. You should take out comprehensive travel insurance (to include medical evacuation for a minimum of $100,000 and yacht insurance (to include wreck clean up and disposal) before you travel.