I will put that in my scanner and hope the talkgroup stays active up here. I know that DSIT has 2 portable trailers with 800, VHF and UHF repeaters on it. It might already be deployed if the search has lasted this long. I suppose the Feds have jurisdiction there since it is a National Park. They probably can't operate on the SC interops.
The dad said he won't go there again. They had an elevated boardwalk when I was there about 30 years ago to take a guided canoe trip. Unfortunately, it had been so dry, you could have walked most of the canoe trail. We did an Edisto river trip instead. The boardwalk would have been a nice trip for kids, just stay on it.