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... by filling a plastic bottle with one liter of air and another one with sea water. Tothe bottle with the sea water I slowly added sand until the weight was high enough to drag down the air filled bottle. I expected that I would need more volume of sand than air to overcome the lifting force.
In our plan for a station in a spherical shape, the idea was to fill the bottom half with sand. Sand is a natural product, very abundant, and the eventual removal of the station can be easily done by simply releasing the sand, which makes the whole thing very ecologic. I wondered whether the sand-filled half would be enough to sink the station. The result was that sand from the Gulf of Antalya with a volume of 0.85 liters are necessary to allow air with a volume of one liter to sink. So we need 15% less sand / water than air. That may not necessarily be startling for physicists, however non-experts expected something different. If we assume that the lower half of the station can not be filled to the brim with sand, it would still suffice to keep it on the seabed. In combination with the weight of the structure, the weight of the furniture and the support legs (made of concrete or also filled with sand?) it is perhaps even possible, to fill more than half of the metal sphere with air, so that the result are bigger living areas.
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