Green Grass of Tunnel

Down from my ceiling drips great noise
It drips on my head through a hole in the roofBehind these two hills here there's a pool
And when I'm swimming
In through a tunnel, I shut my eyesInside their cabin I make sound
In through the tubes I send this noiseBehind these two hills here, fall asleep
And when I float in green grass of tunnel
It flows backDown from the ceiling drips great noise
It drips on my head through a hole in the roofBehind these two hills here, there's a pool
And when I'm swimming
In through a tunnel, I shut my eyes