Any information on this secret / hidden cave in A Coruña, Spain?

There's what 'may be' ( don't know ! ) an intentionally secret / hidden cave in A Coruña' city in Spain. Is there any information about it anywhere ?

• It's on public land, right next to, and below, the https://en.wikipedia.org/wiki/Aquarium_Finisterrae but does not seem to be in any way connected to the Aquarium Finisterrae.

• It has had two large boulders intentionally placed in front of it, either, so that fewer people will notice the cave, or, to prevent the cave or coast being eroded by storm waves etc.

• At some time, a square window was cut into the very thick side of the cave . ( the window can be seen to be square shaped, when viewed from adequate angle and sufficient lighting )

• It does not seem to be mentioned anywhere on the internet https://es.wikipedia.org/wiki/Playa_de_Las_Lapas

Unfortunately I cannot obtain better photos of it.

When looking at it in person from the other side of the bay, you can clearly see it is a cave, and the window ( The window can be seen to be square shaped, when viewed from adequate angle and sufficient lighting ) .

QUESTION
Is there any information about this cave anywhere ( webpage ) ?

NOTE - Due to an odd technical problem, I cannot post any comments .

NOTE - I just added 2 images, from earlier years, a zoom-in of an image from earlier years, and that image without zoom-in, the window or whatever, is clearly / definitely man made .
Remember that you can just click on any image and look at it on another browser-tab, and magnify it, through your browser etc.

NOTE - One possible explanation 'may be', that during storms ( or higher tides ) , the waves 'may' crash against the mouth of the cave, and without a vent, the sudden compression of air in there could cause loud explosion like sounds that may disturb the Aquarium, or even cause cracks etc, so maybe that window is a vent to prevent that.
I assume that what look like holes, above, and to the left of the 'window', are not anything, since it seems they also occur at various other 'insignificant' parts of the rocks.

• The Zoom-in of the image from earlier years, is the 2nd image .