Two Brothers Wall (39°06'17.1"N 23°58'46.8"E) (WGS-84)
Information :Two Brothers are two small islands south of Alonissos. An impressive wall with a passage through an underwater ravine which makes the diving experience unforgettable. Excellent visibility and rich sea life hanging from this really amazing wall. One of the best diving sites.
Maximum depth : 45m
(http://www.alonissosbluedream.gr/dive-sites)