Suddenly he got a terrifying sense of speed. The headland must have lain five miles to south of him; yet in a few moments, even as he watched, it had gone into the vague obliteration of a vastly greater distance.
“What's happening?” thought Stern. The wind had died; it seemed as though the waters were moving with the wind, as fast as the wind; the yawl was keeping pace with it, even as a floating balloon drifts in a storm, unfeeling it.
Deep, dull, booming, ominous, the roar continued. The sail flapped idle on the mast. Stern could distinguish a long line of foam that slid away, past the boat, as only foam slides on a swift current.
He peered, in the gloom, to port; and all at once, far on the horizon, saw a thing that stopped his heart a moment, then thrashed it into furious activity.
Off there in a direction he judged as almost due northeast, a tenuous, rising veil of vapor blotted out the lesser stars and dimmed the brighter ones.
Even in that imperfect light he could see something of the sinuous drift of that strange cloud.
Quickly he lashed the tiller, crept forward and climbed the mast, his night-glasses slung over his shoulder.
Holding by one hand, he tried to concentrate his vision through the glasses, but they failed to show him even as much as the naked eye could discern.
The sight was paralyzing in its omen of destruction. Only too well Stern realized the meaning of the swift, strong current, the roar--now ever increasing, ever deepening in volume--the high and shifting vapor veil that climbed toward the dim zenith.
“Merciful Heaven!” gulped he. “There's a cataract over there--a terrible chasm--a plunge--to what? And we're drifting toward it at express-train speed!”