Nitrogen fourteen goes into their drive tubes, and they drive!

Most of the power was fed into the fusion shield of the drive tube.

The heavy drive tube bangs from the bottom, far beneath the dust.

The drive tubes grew, and their great metal bed-bolts were turned.

The helical weights slide down drive tubes to create power.

The main drive tubes give us the initial impetus for take-off.

That means we go in through the drive tubes.

And if a drive tube can be knocked out, another two.

He did find inspection panels in the drive tube.

They're usually put somewhere near the drive tubes, where the area is too hot to spend long looking.