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Spongia officinalis
Dark grey to blackish sponge, of variable shape and size (up to 30cm in diameter). It encrusts the rocks, but can very fleshy, up to 5 cm thick.
Common sponge in Adriatic and Mediterranean sea; observed several times on rocky bottom in shallow waters close to shores; and looks for shady places.
Update 23.08.2022 - I believed very firmly that this one was so called 'Kidney sponge' or Chondrosia reniformis, but have found the ID this summer, thanks to website DORIS (only in French, as far as I'm aware doris.ffessm.fr) also quoted in references.
Spotted on Jul 27, 2021
Submitted on Aug 31, 2021
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23.08.2022 - ID changed from Kidney sponge to Bath sponge, and text, tags & references updated accordingly.