In 1930, the echo sounder replaced the traditional plumber sounding method.

In 1912, after the sinking of the iceberg, the Titanic caused attention to the detection of underwater objects. British meteorologist Richardson suggested using echoes to detect icebergs. Before the First World War, the American radio pioneer Professor Fresenton took the lead in testing echo sounding and succeeded.

By 1930, echo sounders had replaced the long-established plumbs for underwater detection. Since about 1960, most ships have been equipped with echo sounders with minimal error. Computer analysis is now available to provide live photos under the keel with high accuracy. Therefore, it is no longer dangerous to lead a tanker with a deep draft to enter Hong Kong. The echo sounder is widely used to determine the location, size and depth of submarine obstacles. It is used by oil companies to detect the condition of submarine tubing and to jeopardize the dynamics of the tubing. Marine archaeologists use it to explore the shipwreck.

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