Drowned female scuba diver - Mystery movie #2

Thanks for all the suggestions that came in via comment or mail! Very much appreciated!

Now for another mystery scuba movie…

… some evil frogwoman attacks another frogwoman!

Preview:

(click to enlarge)

And here is the whole scene (and more…):

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A good scene, but the question is, to which movie belongs it?

Thanks for any help in advance!

*EDIT: October 10, 2022:*

Here is the movie title:

殺意の八丈島海流のぞかれた美人作家の殺人日記
(Murderous intent in sea current of Hachijojima – A peeped diary of a beautiful female novelist)

Quite an odd title 😆

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Drowned female scuba diver – Mystery movie #2