There are plans to produce an additional seven vessels.

With only one ship the company required two additional vessels to run a full service to the Channel Islands.

It seems to have assimilated additional vessels, accreted them to its hull.

There are reports of additional vessels with nationals from other countries being detained for several months.

"Why have these three additional vessels not been transferred off the station by the Tholians?"

The contract includes an option for four additional vessels.

It borrowed heavily to fund the acquisition of additional vessels.

An option for an additional five vessels existed, but they were placed on indefinite hold in 1982.

The contract also included an option for two additional vessels of the same design.

The Irene was then burning well so additional vessels were sent for.