According to 4th grade science an iceberg shows just 1/10th of itself above water. This means that the sailor of days gone yore never had any idea how large of a chunk of ice existed below the surface.
This particular image has a history to go with it. This photo came from a Rig Manager for Global Marine Drilling in St. Johns, Newfoundland. They actually have to divert the path of these things away from the rig by towing them with ships!
Anyway, in this particular case the water was calm & the sun was almost directly overhead so that the diver was able to get into the water and click this pic. They estimated the weight at 300,000,000 tons."
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