Now, however, with heightened intensity, considerable energy is devoted, to competing for position and a definite undercurrent of competition permeates the relationship.
Although I really appreciated it, I usually politely declined because there was always an undercurrent of hoping that I might be converted, and I really don't like to disappoint people.
Part of the Titanic wreck is known to lie close to a section of seabed affected by a stream of cold, southward-flowing water known as the Western Boundary Undercurrent.
The flow of this " bottom current" creates migrating dunes, ripples and ribbon-shaped patterns in the sediment and mud along the ocean floor that have given scientists insights into its strength.
The strong surface currents that can carry boats and swimmers off course are probably more familiar to us, but the deep ocean is scoured by underwater currents too.