This sponge was seen at Hadal Wall. The swelling may indicate that the sponge has engulfed its prey.
Sponge
Image courtesy of NOAA Office of Ocean Exploration and Research, 2016 Deepwater Exploration of the Marianas. Download larger version (jpg, 585 KB).

This sponge was seen at Hadal Wall. The swelling may indicate that the sponge has engulfed its prey.

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