Recent video, published by SIF spotlights dugongs at Aldabra. However the atoll is their last refuge in the Seychelles, the featured dugong allowed the SIF team to get quite close. The encounter took place at the lagoon near Ile Esprit.
The Animal Diversity Web's summarizes a wide range of information about these mammals.
(Photo was made by T Mahoune, and featured on FB, meanwhile the video was edited by AJ Burt)