We are under attack from an unknown vessel, request any assistance possible.

While there, the Soviet Union planned to send inspectors to also study the unknown vessels.

This unknown vessel hits her a few hours ago.

But the unknown vessel spun out of the way and moved away from the sta-tion, picking up speed with every passing moment.

All of the accounts agree on the manner in which the unknown vessel arrived at Yarmouth.

Then on the 25 and 26 April she took two more unknown vessels, both carrying rum and rice.

We have an unknown vessel about four hundred miles up and to the north.

According to Alex, all the damage had been caused by a single strafing run of the unknown vessel.

As Voyager comes under attack by unknown vessels, equipment and weapons begin disappearing from the ship.

The colony is apparently under attack by an unknown vessel.