Here's a long shot (just joined to ask this question. This has been racking me, my brother's and Dad's brains for years.
In 1993 - 1994 we played a PC game on our Amstrad 286 (showing my age), it might have been a demo on a PC Format disc, but not sure.
It was a first person sandbox style, the graphics were similar to Magic Carpet, Alone in the Dark, Another World and EPIC.
All we remember is having the ability to roam an island, and do whatever you want ? there were vehicles, and aircraft around this island that you could hop in and fly around. For example, there was a hot air balloon, a yellow plane that would also go underwater (weird). The thing I remember the most about this game was that after roaming around the island for a while, I think it got dark ? I found a box and you looked in it, it was a bomb! I remember running away from it and there was a flash on the horizon from the explosion. The game was seriously atmospheric and ahead of it's time. It felt like a very primitive version of GTA3 (although of course it was years before)
Having looked for this game for years we're thinking it might have just been a demo on a magazine.
Any leads would be much appreciated !