im stuck on the part where you have do get past the giant eel from the roof of the cave, iv done all the other bits i just cant get passed it? someone helpp !!

Navigate the passage on the far wall to get to a lone Manta in an open chamber. Herd the Manta(be sure to get the air power up) back through the passage by getting behind it and sonar-ing(Manta song-ing) it to direct it back into the main room. Proceed to direct it towards the giant eel. Once the Manta is directly beneath the giant eel(between it and you) book it towards the hole that the eel was guarding. It gets pretty difficult after that.