Mr Bierce's disappearance is as you know one of our national mysteries. I was thinking of something a little less grandiose than the traditional projects that NatGeo funds. Their backing would be for cache purposes only. The lower the profile at this time the better regarding affairs down there. Anyway, as you observed and I'm sure Mr Bierce would agree my idea isn't lacking for imagination.
If I thought I'd make a wart on a storyteller's backside I'd be glad to try to put a hypothetical account together with that concept in mind a la Indiana Jones if you'll forgive me the comparison.
Thank you for responding.