With all the firearms in my pockets, I'd have sunk like a rock without the extra buoyancy.

The weight of a structure needed to keep an evacuated balloon from collapsing would more than offset the advantage of the extra buoyancy.

But for the first and last ones, the helium provided the extra buoyancy needed to support the weight of the tethering cables.

As a result, we'll only need about ten k-tons of extra buoyancy.

This results in a larger volume which creates extra buoyancy requiring a corresponding use of heavy weight to keep the housing underwater (about 64 lbs.

The ship was filled below deck with barrels, hoping that the extra buoyancy would raise the ship at high tide.

Another safety feature consisted of airtight copper tanks within the boats' sides to provide extra buoyancy.

The ship also featured a set of 21 vertical watertight compartments for extra buoyancy.

"Because it will give us extra buoyancy, so we won't get stuck," Tom explained.

The gravity of this planet was slightly less than at Outworld, giving extra buoyancy.