Just taking a few guesses after listening to the song.
Definitely feel free to fill in the blanks. I'll bold the missing parts or parts I'm not sure of.
Oh, Oh, Oh, Oh,
Oh, Oh, Oh, Oh
Lucy's underground
She's got a mouth to feed
Am I underground
Or am I in between
Lucy's underground
She's got a mouth to feed
Am I underground
Or am I in too deep
Show me love
You've got your hand on the button now
Sure enough
You've got your hand on the button now
Oh, Oh, Oh, Oh,
Oh, Oh, Oh, Oh
Oh, Oh, Oh, Oh
Oh, Oh, Oh, Oh
Lucy's underground, she's never comin' back
Am I still alive
Or has the light gone black
Take me underground
Take me all the way
Bring me to the fire
Throw me in the flame
So, show me love
You've got your hands on the button now
Showin' love
You've got your hand on the button now
I'd rather die,
I'd rather die,
Than to be with you
Oh, Oh, Oh, Oh,
Oh, Oh, Oh, Oh,
(than to be with you)
Oh, Oh, Oh, Oh,
Oh, Oh, Oh, Oh,
(da da da da...)
Oh, Oh, Oh, Oh,
Oh, Oh, Oh, Oh,
Oh, Oh, Oh, Oh
Oh, Oh, Oh, Oh