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The fish was approx 2 metres in length and found in approx 2 metres of depth: https://www.youtube.com/embed/A1_6F2Z4abU
Apparently this is only the 3rd reported sighting in Port Phillip Bay in 109 years: http://www.discoverlife.org/mp/20m?kind=Trachipterus+trachypterus

this Octopus vulgaris was accompanied at least for some minutes by two Serranus scriba (compare https://www.inaturalist.org/observations/136894786 and https://www.inaturalist.org/observations/136894794), a Serranus cabrilla (compare https://www.inaturalist.org/observations/136894795) and a Symphodus rostratus (compare https://www.inaturalist.org/observations/136894787). The observed individual specimen are the same as can be seen in some of the pictures of this Octopus observation.

The small group of Serranus and Symphodus followed the Octopus and all were just looking at the Octopus. When the Octopus moved (several times) they followed and waited again...

20.03.2022 The observation was made in a small cave. The first 4 pictures got an increased brightness to get a better understanding of the structure; the additionally added 4 pictures are showing the original brightness.

Bispira cf. mariae
Regarding the difference between B. mariae and B. volutacornis, Trainito and Baldacconi claim in their "Atlante di Flora e Fauna del Mediterraneo" (6th ed. 2021) mariae is the species of the Mediterraneis, whereas volutacornis is found in the Atlantic Sea. But I cannot say how they came by this information.

Sighting the relevant Bispira specimen on iNat I come to the conclusion that the Bispira "volutacornis" respectively "mariae" of the Atlantic coast of Europe are mostly (but not all) comparatively pale in color, variable in color, the bands of the crown are pale or nonexistent. ~ Bispira volutacornis?
The specimen of the Eastern Mediterraneis and Adriatic are mostly (but not all) of a comparatively dark brownish/orange color, mostly with prominent white and black bands. ~ Bispira mariae?

(In the Western Mediterraneis the rate of pale and uniformely colored specimen seems to be somewhat higher than in the E-Med.)