The coral-like creatures may have built the superstructures to protect themselves from predators or to soak up the nutrients from ocean currents.
As NOAA's '30 Days of the Ocean' draw to a close this weekend, we take a look at some of its wonderful underwater camera work.
Ecologists relocated fertile crayweed from surrounding coastal areas to two barren reefs to provide food and shelter for undersea creatures.
If you think you know what a thriving coral reef community looks like, take a look at this trailer for the upcoming IMAX movie "Journey to the South Pacific." Continue reading →