The second most complex installation is in fresh water. Cost
for a fresh water installation is about 2% above that of a basic land installation.
The most complex footer, column and base is one constructed in sea water. The aircraft
has to be coated with salt resistant sealant and paint. The bearing and column has to be
made from special types of steel to prevent corrosion. The cost of a salt water
installation is about 15% higher than the basic land