But as the late-evening supper was being served, the ship struck what Cunard later called an "uncharted underwater obstacle."

More than half a million of these lethal underwater obstacles now stretched along the coastline.

On their approach to the shore, two of their ships struck underwater obstacles and sunk.

Because of the very cold water and the presence of underwater obstacles near the shorelines, swimming is discouraged.

Jim had an eye for a shapely leg, even one generally showing scars from many brushes with underwater obstacles.

They also used explosives to demolish underwater obstacles planted by the enemy.

A team of investigators arrived to prepare for a public hearing into why the Cunard flagship hit an unmarked underwater obstacle.

"Dodging underwater obstacles over a shallow bottom in the dark is no exercise for an amateur yachtsman."

The castaways must avoid both above and underwater obstacles.

He attempted in 1851 to reduce this underwater obstacle by blasting.