In turn, the additional investment will provide buoyancy to the price, thus completing a positive feedback loop.

There are pneumatocysts at intervals along the fronds which provide buoyancy.

They are 310ft m long, 50ft m wide, and 17ft m tall, and contain 21 water-tight air-filled cells with leak detectors to provide buoyancy.

Like the fin and tailplane, the wing was a fabric covered wooden structure, but one subdivided into sealed cells to provide buoyancy in case of hull flooding.

Large oil or gas drums were cleaned and filled with medical supplies and food, with enough air space to provide buoyancy, and strung together with rope.