Lyrics:

Only one tenth of the mass of the iceberg
Is visible above the surface of the water
The vast majority being hidden underneath

This phenomenon is not restricted to icebergs
"The iceberg model" is a look inside the head of a man
Who, on the surface, is confined in a restrictive environment
And yet possesses immense potential within his mind

It shows how, eventually
The external pressures become so great
That they throw his internal thought world
Into chaos