There are natural explanations too. For example, a combination of methane and salt water eliminates buoyancy, causing anything on the surface of the water to plummet straight to the bottom of the ocean. Methane can be filtered through cracks on the ocean floor, caused by earthquakes or slight eruptions.
As a 15 year old, reading about the Philadelphia Experiment, also known as Project Rainbow, this provided another possible explanation. I remember even writing to the American Consulate, requesting info on US Naval Intelligence Ops during WWII. In July 1943, the US Government was interested in finding a way to make ships vanish, without being detected by radar. The destroyer U.S.S. Eldridge arrived at Delaware Bay for a Naval Intelligence experiment. According to eye witness, Carlos Allende, the Eldridge vanished completely. It apparently reappeared moments later in Norfolk-Newport dock for just a few minutes before returning, with horrific results on the crew, causing the project to be immediately shut down. Although, there has been some speculation on the authenticity and credibility of Carlos Allende (aka, Carl Allen) as a crank and disinformation agent, he communicated extensively with astronomer, Morris Jessup, author of The Case for UFOs (1955). Jessup came to believe in an elaborate UFO conspiracy involving two races of aliens. Allende heavily annotated a copy of Jessup's book, causing Jessup to become increasingly obsessed and confused by their correspondence. The navy later had Allende's version of the book published. However, despite their best efforts, neither Jessup or the Navy could ever track down the mysterious Carlos Allende. In April 29, 1959, Morris Jessup was found dead in his own car, apparently from suicide by asphyxiation.
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