Location: Green Key, New Port Richey FL, 28.2517N 82.7522W
Date: 1975, Summer.
Time: After sunset but there was still a slight glow in the sky. We were at the beach looking out over the Gulf of Mexico. The glow of the sun after it set could last for hours.
Weather: Partly cloudy
I was 18
A friend and I had come to the beach to enjoy a couple of beers after work. We sat on the hood of my car and chatted about the day while looking out over the water.
What appeared to be a small, single engine plane caught our eye as it flew in our general direction from out over the Gulf of Mexico. It had the typical red and green lights and a couple of dimmer white ones. The speed is what you'd expect of a small Cessna type craft.
This turned into something unusual when the direction of travel went from horizontal to vertical. It appeared to pitch downward in an arc as if it had just turned a corner, but down. It continued at the same speed it had been flying until it reached the surface of the water, at which point it stopped. I can't say if it was hovering or if it had actually landed on the water but the trajectory never veered from vertical.
At this point, it seemd like the lights became brighter and seemed to pulse or throb. The object stayed an the water's surface for probably 30-60 seconds. It departed much faster than it arrived. The object basically left the water's surface at maybe 15°-20° from straight up and continued travel in that direction until we could no longer see it. The duration of the departure flight was a mere 3-5 seconds until it was completely gone.
What did I witness that night?