There is clearly a reference to the idolatry of Egypt. Many subterranean chambers in rocks upon the shores of the Nile exhibit ornamentation and hieroglyphical characters, some of which are representative of the objects of idolatrous worship. Such chambers fitted them for the scene of the ideal picture by which Ezekiel represented Egyptian idolatry. The Egyptian worship of animals is well known.
Related Commentaries of Ezekiel 8:10
Ezekiel 8:10
10 So I went in and saw; and behold every form of creeping things, and abominable beasts, and all the idols of the house of Israel, pourtrayed upon the wall round about.