There's 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 odd tech problem, I cannot post any comments .