According to reports, the Navy calls attributed the venturi effect.
Navy officials have released preliminary findings into Monday's collision between a Norfolk-based submarine and a Japanese oil tanker in the Persian Gulf
The Navy says the sub Newport News was submerged and heading into the Arabian Sea when the mammoth oil tanker passed overhead at a high speed, creating a sucking effect that made the sub rise and hit the ship.
Lieutenant Commander Chris Loundermon, a spokesman for Submarine Force in Norfolk, says the result was the "venturi effect," when the ship "ended up sucking the submarine into it."
The Navy says no one was injured aboard either ship, and damage to both vessels is relatively minor.
The Newport News left Norfolk along with the aircraft carrier Eisenhower strike group
in October for a six-month deployment to the Middle East.
Source: Pilot Online