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When I had just started my sea career, I never understood how the depths of the entire ocean was measured.
I mean 70% of the earth is covered with water. How was this nearly impossible task of measuring the depths achieved?
Over the years I realized that it was not done in few days and not by few men.
This task is ever going since hundreds of years and the hydrographic offices of the countries are conducting these surveys regularly.
The only thing that has changed over the years is the method of conducting these surveys.
In early days the survey was done with hand-lead lines and single beam echo sounders.
It then changed to the wire-drag method where a wire was dragged by two or more ships with weights submerged to the fixed depth.
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About Capt Rajeev Jassal
Capt. Rajeev Jassal has sailed for over 24 years mainly on crude oil, product and chemical tankers. He holds MBA in shipping & Logistics degree from London. He has done extensive research on quantitatively measuring Safety culture onboard and safety climate ashore which he believes is the most important element for safer shipping.
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