Neutral buoyancy diver maintains neutral buoyancy by continuous correction, usually by controlled breathing, as neutral buoyancy is an unstable condition for a compressible object in a liquid. The mathematician Archimedes discovered much of how buoyancy works more than 2000 years ago. In his research, Archimedes discovered that an object is buoyed up by a force equal to the weight of the water displaced by the object. In other words, an inflatable boat that displaces 100 pounds (45 kilograms) of water is buoyed up by that same weight of support. An object that floats in the water is known as being "positively" buoyant.
The Legend of Heroes: A Tear of Vermillion the number from the title, and was known as simply ""The Legend of Heroes: A Tear of Vermillion"". A Korean conversion of the original PC-9801 version was released for the MS-DOS/IBM PC by Mantra and Samsung in 1997. Some confusion was caused by the US release of this game. While the remake of "The Legend of Heroes IV" was the first to be released in the US, the PSP remake of its predecessor, "The Legend of Heroes III", had been released several months before it in Japan. "The Legend of Heroes III" was eventually released in the US in 2006,