Re: Cousteau's movie etc. (was: ?)

[hylands@ibm.net (Jon Hylands)]

On Mon, 08 Mar 99 10:31:15 +0100, you wrote:

> One thing I noticed is that the two subs went down quick and released a weight 
> when close to the bottom. I would expect they go directly up to the surface: 
> No they were then neutrally buoyant! They seem to have a extra weight to make 
> them very negatively buoyant, that is released later... or was it just for the 
> test?

All deep diving subs do this. These subs are not really deep-diving,
but they seem to be based on a previous sub that was.

You can't use compressed air/ballast tanks once you get down past a
certain point.

They drop a second weight when they want to surface, BTW.

Later,
Jon