And They Were Through. There Wasn't Any Pass. There Was Only A
Broken Eggshell Of Ringworld Foundation Material, Stressed By Terrific
Stresses To A Few Feet Of Thickne
And they were through. There wasn't any pass. There was only a
broken eggshell of Ringworld foundation material, stressed by terrific
stresses to a few feet of thickness; and beyond that, the crater in
Fist-of-God Mountain.
They were falling. And the crater was full of stars.
-- "Ringworld"