Definitions for "Deep water"
Where water depth is greater than one-half the wave length. Deep water conditions are said to exist when the surface waves are not affected by bottom topography.
Waters deeper than 750 m in relations to offshore oil and gas operations. Deep Water Jack-Up Rig -- A jack-up drilling rig capable of operating in water depths in excess of 350 feet.
dense (cold, salty) ocean water that sinks in polar regions and flows around the ocean floor.
Keywords:  trouble, serious
serious trouble
Keywords:  feet
More than 1,000 feet deep.