(Synaptula media)
When I look at this photo, I feel remorse, because after taking it I brushed accidentally against this sponge and three of these sea cucumbers were attached to my dive suit. I didn't notice until I surfaced, so I had to pry them off and throw them back in the water. So they probably became fish food!
Nikon Coolpix 5000 in sealux housing and subtronic flash
. Copyright Teresa Zubi