dr. william kelso and that's called in the trenches tour. that's a little extra and he takes you under the ropes, so you get an up close-and-personal look from his perspective. >> how could this have been considered lost for hundreds of years? >> that's an interesting question. i think it wasn't lost for probably the first 100. but nobody mentioned -- you know, didn't talk about it. at least any documents that survived. we don't know if it's in there. and then there were travelers that came in here and said -- and there was tremendous erosion on the west end of the island, and they said i can see remains of the fort being lost into the river. i read that about a week before i started, you know, oh, no. and so then it became just, you know, the story agreed upon. i think, then, there was also a confederate earthwork here, a large earthen mound was all over most of what we found, the fort site, not right in here, but very close. and -- well, there was no clue on the landscape of anything but this civil war fort. you know, on a site like this,