Had an engine failure at night, over the Atlantic off Jacksonville, FL. Had two trainees with me in the cabin, was trying to make sure one of them was strapped into into his seat when we hit the water. Got bounced around a bit. Aircraft remained upright with one engine still working (superior flying by the pilot), so we water taxied 15 miles to the shore at Ponte Vedra, lowered the landing gear, and pulled it up on the beach. Didn't have any issues right away but within a year I was having serious back problems, turned out to have crushed two vertebrae and blown a disc. They cut me loose with 20% disability at 17 years, needed 30% or 18 years to qualify for medical retirement. C'est la guerre.