Stryderunknown said:
English marine geologist Alan Judd (Ebersole, 2001):
How could methane sink a boat? In order for a boat to stay afloat, it must displace, or push outward, a mass of water that is equal to its own mass. A stone sinks because it cannot displace water equal to its concentrated mass. A plume of methane gas bubbles rising under a boat would make the water around the boat less dense by turning it to foam. The boat would no longer be able to displace enough water to stay afloat and would drop like a stone. The sensation, to a sailor caught in such a situation "would feel like being on an elevator going down" said Judd.
The first time I saw this suggested, however, was in an article in the journal
Science (Appenzeller, 1991:1792). The article mentioned an "unnamed petroleum geologist" who suggested that "pulses of gas released from hydrate layers might explain the loss of ships and planes in the Bermuda Triangle." The idea met with a certain amount of scoff at the time, but it appears to be gaining in credance.
Either way, the article in
Science provides some very intersting facts on methane hydrate deposits of the southeast coast of the United States and the article from
Current Science is short, but interesting on the topic of the North Sea's "Witchground."
Bruce Denardo at the Naval Postgraduate School in Monterey, California is also researching the idea that methane releases can sink ships (Marchant, 2001) and conducted a test of the hypothesis in a closed system of a laboratory. They found that the floated object would float until the bubbles were switched on. Denardo's working hypothesis is that the upward drag of rising bubbles would provide
lift rather than create situation for sinking. He cites his test as inconclusive so far since it was conducted in a closed environment (a glass beaker) and doesn't allow for the formation of currents.
Denardo apparently has an article in
American Journal of Physics (vol 69, p 1064), which I haven't seen, but there's also a news bit in
New Scientist (Marchant, 2001) where I got this info.
@ Hannah: I'm just curious, what do you consider "huge" in regards to the length of your paper? In what's been posted so far, you have some good working material for about 8 - 10 pages and already a few citations for your bibliography. Your school library should have access to the journals and magazines (New Scientist), if not, let us know.... I can get you scans in .pdf for Acrobat Reader. There's only a few pertinent pages.
I'd also suggest getting a hold of one or two of the popular pseudoscience/speculative books and contrasting the
reasoned arguments presented in this thread so far with the
speculative arguments of people like Berlitz, Daniken, and Graham Hancock.
This is certainly a viable and interesting topic for a
Pseudoscience forum.
Sources
Appenzeller, Tim (Jun. 28, 1991). Fire and Ice Under the Deep-Sea Floor. Science, New Series, Vol. 252, No. 5014. , pp. 1790-1792.
Ebersole, Rene (11/9/2001) Bubble Trouble Current Science, Vol. 87, Issue 6, pp. 10-11.
Marchant, Joanna (Sept. 29, 2001). Archimedes may hold the key to the mystery of the Bermuda Triangle. New Scientist, Vol. 171 Issue 2310, p12