Something dropped from the tunnel roof onto the top of his head.

A very bright spot of light appeared on the tunnel roof above them.

Soon, the whole tunnel roof was collapsing on top of the ship.

Find and climb the 79 wood steps that lead up through the tunnel roof.

Hope almost died when he found that the tunnel roof had partially collapsed.

However, the tunnel roof (or bridge) was found to be sound.

In this environment, extra support for the tunnel roof and walls may not be required.

They weren't even sure if they'd escaped the collapse of the tunnel roof.

And no wonder we couldn't find any opening in the tunnel roof.

The tunnel roof was lower here and they walked on with heads bowed.