Porifera Hexactinellida (Glass Sponge) Published September 21, 2020 at 720 × 540 in Porifera Overview Image Gallery: EX1806 – Dive 04 Blake Escarpment South ← Previous Next → An individual glass sponge similar to those on the previous image was seen on rock slabs at the base of the dive’s steepest portion (depth = 1315 m).