Tied up to the bollards on the seawall was a submarine, one of the Destiny I'll-class ships, the computer-controlled unmanned vessels.

An unmanned Japanese underwater vessel reached the floor of the deepest part of the world's oceans today and discovered fish living there, researchers said.

The giant unmanned vessel lifted majestically into the air and soared far beyond Pacific Base into the moonlit sky.

Then a fierce swell sends the captain himself flying and the unmanned vessel disappears from sight.

The unmanned vessel, known as a Scorpio 45, then worked for several hours, trimming the material that ensnared the submarine.

They sent an unmanned vessel first, before they sent a manned vessel.

But of course, they could not be left aboard unmanned vessels, and so perforce had been removed to two other, more luxurious, hostels.

A suite of sensors "capable of tracking quiet, modern diesel electric submarines" will be implemented into the completely unmanned vessel.

The combination Spike missile/12.7mm armed variant has been tested on an unmanned vessel.

This was the first time a vessel, manned or unmanned, had reached the deepest point in the Earth's oceans.