Andaman & Nicobar Islands

An isolated archipelago (well two) of islands in the Indian Ocean between Indonesia to the south, Myanmar (Burma) to the north and Thailand to the east, but politically they are part of India (whose mainland is much further west), officially at least, and only due to the fact that the islands fell under British colonial rule, together with India, until the latter's independence (after a short interruption of the link by way of occupation by Japan during WWII). Culturally, historically and ethnically, however, these islands are quite a distinct entity. 
For the dark tourist they are of interest mainly for two things: the 2004 tsunami and a an old British colonial prison/penal colony.
The islands were one of the regions hit worst by the 2004 Boxing Day tsunami – cf. Banda Aceh, Sri Lanka and Thailand. The islands especially in the south lost a significant amount of territory, now submerged. Thousands died and even more were made homeless. However, amongst the indigenous population, there were hardly any losses. It was said at the time that that was so because the aboriginal islanders had been much better prepared for such an event through oral tradition and thus knew how to read the signs in time so they could take refuge on higher ground before the flood waves came. 
As far as I know, there's nothing commodified for tourism relating to the tsunami (though there are still swathes of damaged land with dead trees and swamps left behind by the tsunami's flood waves). But most people rather flock to the islands' pristine palm-fringed beaches and water-sports & diving centres. 
In contrast to that, the other dark site on the islands is very much part of the local cultural tourism agenda:
You may also have heard stories of aborigine “stone age” native tribes who not only still shun any contact with the modern world but actively resist it, if need be, by force. This included the killing in 2006 of two fishermen who had the misfortune of getting stranded on the shores of one such tribe's territory. But do not worry – these territories are protected and no one is allowed to visit them in any case. 

©, Peter Hohenhaus 2010-2016