A: Cement bags. Just chuck ’em in the water around the island and they’ll quickly harden. Ever since the mangroves were removed off Carrie Bow the island has been changing shape and shrinking. To stop it disappearing forever, cement bags have been placed around the north end of the island to try and hold the sand in place. Apparently, it’s been working!
That’s not to say though that the island isn’t still changing shape. Sand moves around the island constantly. Each time I come here, the beaches look different (more sand, less sand, more debris etc.). It goes through seasonal changes and storms can have a huge affect. When I was here in a tropical storm, the beach at one end doubled in size!