Undercurrent n. : A current below the surface of water, sometimes flowing in a contrary direction to that on the surface.

Undercurrent n. : Hence, figuratively, a tendency of feeling, opinion, or the like, in a direction contrary to what is publicly shown; an unseen influence or tendency; as, a strong undercurrent of sentiment in favor of a prisoner.

Undercurrent a. : Running beneath the surface; hidden.

Example:
Do you ever experience an Undercurrent of bad feelings?

Taxonomy
Undercurrent, scuba diving magazine, Dive Trip, Belize, scuba diving, scuba diving equipment, Indonesia, Scuba, subscribers, Red Sea, Fiji, dive destination, Regulator, Reviews Dive Resorts, the Consumer, Consumer Reports, Business Week, best dive.

Defination from the web:
Online scuba diving magazine providing reviews of dive resorts and scuba equipment.