Previously it had been thought that the phenomenon could be a response to noise pollution caused by increased human maritime traffic.

Close to land, where there was increased maritime traffic, this shortened to 20-minute catnaps.

Deep sea shipping, intercontinental shipping or ocean shipping refers to maritime traffic that crosses oceans.

In 1811, commercial maritime traffic was authorized, and customs were established later in 1823.

It was feared that she would sink at the main dock on the island and disrupt maritime traffic.