Big fan of the game - my brother downloaded it from steam about 2 months ago and he and I have been hooked since then. I was listening to the Retronauts Podcast wherein Jeremy Parish from that site interviewed Dan Adleman and Tom Happ about the game. He said something VERY interesting that I haven't seen anywhere online.
During the interview - specifically at 65:13, Tom Happ says:
The final boss you come to in the game was originally a different shape, but I realized in this end battle I wanted to be able to have Athetos and Elesonva both in the scene. So this boss I had designed, which was sort of like at the end of an underground corridor, wouldn't fit that at all, so I ended up just not using that design, period. But you can still see… there’s actually a way to glitch it so you can find that boss. And he… I think he’s somewhere near where the actual Athetos end boss is in the game.
Has anyone found this? Does he mean using the Address Disruptor or bombs? I think it seems more likely there’s a code to put into the tool that will open this up. I assume this would be somewhere in Mar Uru.