The Pacific Sandpiper, a specially built cargo ship with safety features far in excess of those found on conventional vessels, left Britain's Barrow port bound for Japan the other day.

The security surrounding its departure on Jan. 21 indicates that something out of the ordinary is aboard. The Pacific Sandpiper and several sister ships make no port calls on their voyages between Europe and Japan because they carry potentially lethal nuclear material.

In the Pacific Sandpiper's hold on this journey to Japan via the Panama Canal is only one item of cargo — a giant cylinder weighing more than 100 tons. Inside are 28 containers, each made of stainless steel nearly one-third of a meter thick. They are packed with 14 tons of highly radioactive waste that has been turned into solid glass form to make it safer and easier to handle.