Although the cave was known from a long time ago, it was believed that it disappeared because of the urbanization and construction works made at the end of the 20th century and beginnings of the 21st. It was found again and explored on May 1, 2016, by eightspeleologists from the Basque group ADES Espeleologia Elkartea. After opening the entrance duct, located on a hillside in an urban environment, the cavers entered unknown galleries, and forced a step to a room where they found the panel of engravings.
Rock art
Some of these forms and the etching technique used were announced to be "identical" to those found in the French Pyrenees which suggests that there could have been links between the inhabitants of both areas. Already described as a “treasure of humanity.” the depictions are among the largest found to date – some measuring up to in length. A surprise was the first Paleolithic representation of two lions in the region. In a first analysis the etchings were estimated to date from between 12,000 and 14,500 years ago. The main panel is beautifully and masterly carved with animal figures, displayed in a complex composition, suggesting some sort of perspective. All of them have been engraved with the same technique, scratching the soft limestone with the fingers of with a dull point, resulting in very detailed and easy to see figures. The animals are represented with high detail, typical from Magdalenianart style. Represented animals are horses, bisons, ibex and some carnivores. One of this carnivores has been undoubtly interpreted as a lion, which is an animal rarely present in Magdalenian art. Besides, several sings, including clear claviforms, have been found there. The conventions used for representing animals and the presence of claviforms suggest that the figures could be related to the Late Magdalenian art. Not open to the public, 'extremely difficult to access', located under a residential building in the center of Lekeitio, the need to preserve the paintings outlines the current impossibility to access the artwork.
Conservation
The cave has a serious problem with floodings, due to construction and urbanization activities which have profoundly altered the course of the underground river. The episodic inundation of most of the galleries of Armintxe has already brought the deterioration of an undetermined part of the artistic heritage it encloses, and threatens to destroy the whole art ensemble. To solve the problem, it is necessary to finish the exploration in order to understand the hydrogeological behaviour of the karst as a whole; but this exploration is actually paralysed due to disagreements between Administration, archaeologists and speleologists.
