It’s a reef in progress! Off the Thailand coast, underwater pyramids of concrete blocks are forming the beginnings of an amazing artificial reef … and nearby in the shallows is a nursery for fledgling corals. This reef-in-the-making is already attracting plenty of marine life (keep an eye out for a pufferfish getting some dental work done courtesy of a busy cleaner wrasse). Dive trips kindly sponsored by Raya Divers, Thailand