Sand bubbler crabs and green ants

In a search for information and identification of some strange little crabs we saw in Australia, I found this. Unless I am very much mistaken (I am counting on my friends to either confirm or deny), this gentleman took pictures of the exact ant nest and bubbler crabs on the exact same beach where we found them. For that matter, I think jFrog has a picture of that precise nest somewhere in his collection. This is just too weird.