Pretty cool, the following link at slashdot.org:

http://science.slashdot.org/article....23&mode=thread
http://science.slashdot.org/article.pl?sid=04/02/27/1837223&mode=thread

reads as follows:

*from the in-this-house,-we-obey-the-laws-of-thermodynamics dept.*
An anonymous reader writes /"Using the same physics principles as
submarines, a new company is planning a fuelless air ship
http://www.fuellessflight.com/. Recent advances in ultra light and
strong materials are making this concept a practical reality
http://www.machinedesign.com/ASP/viewSelectedArticle.asp?strArticleId=56635&strSite =MDSite&Screen=AEROSPACE&catId=379."/
There's no question that changes in buoyancy can be used to propel a
vehicle
http://science.slashdot.org/article.pl?sid=03/11/24/0438213&tid=126,
but "fuelless" is going to be tricky.

The original article above at slashdot references the an article from
Machine Design Magazine as described below...

http://www.machinedesign.com/ASP/vie...PACE&catId=379

Tim