THE ORANGE-AND-WHITE HERCULES 130HC long-range surveillance aircraft had taken off at dawn from St. John’s and headed east on a seven-hour flight for the International Ice Patrol. Cruising at three hundred fifty miles an hour, the high-wing aircraft would cover a thirty-thousand-square-mile expanse of ocean before its patrol ended.

The Coast Guardsman at the plane’s radar console was daydreaming about his upcoming date with a young Newfoundland woman. He was working on a plan to get her into bed when he saw the suspicious blip on the plane’s radar screen.

Training set in. The radarman put aside his prurient thoughts and focused on the radar screen. The four-engine turboprop carried radar that looked forward and sideways. The side-looking radar, or SLR, had picked up the large object in the water around twenty miles to the north.

Iceberg detection had come a long way since 1912, when the ice patrol was created to prevent a repeat of the Titanic disaster. Despite the technological advances, identification is considered more of an art than a science.

The radarman tried to decide whether the object was an iceberg or an anchored fishing boat. A smooth-edged moving target would denote a vessel. The blip was almost stationary and showed no sign of a wake. His practiced eye picked out the radar shadow, where there was no radar return on the far side of the target, a phenomenon that indicated that the target was taller than a ship.

Iceberg.

He notified the cockpit of the sighting and its location, and the plane veered off on a northerly course change.

The fog hanging over the ocean surface prevented visual identification until the very last minute. The plane dropped down until it was several hundred feet above the water. The mists cleared to reveal an iceberg with a tall, narrow pinnacle at one end. Then the fog closed in again. The brief glimpse was all that was needed.

The plane sent the iceberg data to the ice patrol’s operations center in Groton, Connecticut. There, a computer figured out the iceberg’s probable drift. A warning was broadcast over the radio as a bulletin to the maritime community. The report was picked up by a Provincial Airlines Beech Super King that had been patrolling the Grand Banks under contract to the offshore drilling industry.

The two-engine plane homed in on the broadcast coordinates. The fog was clearing, and the plane found its target with no trouble. After making a couple of low-altitude passes, the plane radioed a confirmation of the sighting to the drilling platforms and vessels in the vicinity.

THE Leif Eriksson had been cruising at a lazy meander when the vessel received the urgent message. Immediately, the ship’s twin ten-thousand-horsepower diesels flexed their muscles in a noisy display of power. Leaving a creamy wake in the gray seas, the vessel raced off like a motorcycle cop chasing a speeder.