You can always fly drones around.
Edit: Non-Lethal, Non-Army drones. Just flying cameras to see what's happening there, or how they're living. Even better, really small cameras that look a bit like slow-moving birds.
A couple of years ago I was driving on the I-95 from Las Vegas to Tonopah. Out of nowhere, a predator drone came up and flew next to our car for a good couple of hundred yards. A strange and somewhat frightening experience, even for someone who knows what drones are.
Besides, the thick jungle canopy wouldn't allow drones to get a good look anyway. We could launch crawling cameras, disguised as forest creatures, but the risk of getting exposed isn't worth the potential damage to the tribe, IMHO. I think the best thing to do is to just leave them alone.
Because a huge tanker stuck in the water would not freak them out, maybe? It's way more impressive than a small drone flying around, for people who don't even have boats.
They look pretty freaked out to me. Their gazes are out of this world, very intense.
No way are there going to be drones around Andamans anytime soon.
[1] http://en.wikipedia.org/wiki/Andaman_and_Nicobar_Command