Ecco The Dolphin Wiki

The Asterite's Cave is the 13th level in Ecco: The Tides of Time.

This level takes place in Trellia's future. Ecco has to make his way to the Asterite's cave and speak with The Asterite. After speaking with the Asterite, Ecco has to swim down between the spiral of globes to reach a bubble that allows him to time travel back to the present.

You will need to move quickly after talking to the Asterite to go between the globes as they have collision that will push Ecco out if they move too fast or too slow.