They had scarcely completed the task of carrying up the newly-arrived stores to the shelter which they had made in an angle of the rocks when Vickers hailed them from a spur of the cliffs and waved his arms excitedly.
"I say, you two!" he shouted.

"There's a craft coming--from the south-west.

Come up! There!" he added, a few minutes later, when they arrived, breathless, at his side.

"Out yonder--a mere black blot--but unmistakable! Do you know what that is, either of you?
You don't?
All right, I do--ought to, because I'm a R.N.V.R.

man myself.