according to the query of cool music, we know that the blue scenery of distant mountains under the sea is the lyrics of the song Tide, originally sung by IN-K/ An Suyu/Fu Mengtong, written by An Suyu/Shuxin, composed by IN-K, and released on August 21st, 22.

The lyrics of the song Tide are as follows: the blue seabed, the scenery of distant mountains, our distance is out of reach, the retreating love, and the memories left, looking for your figure crazily.