A 1966 study by the U.S. Navy noted that "The passage of large-amplitude internal waves could make submarine depth control difficult, particularly when the submarine is running quietly at low speed." ...

No cause has been established for the sinking earlier this month of the KRI Nanggala with 53 people aboard, but officials have suggested that it may have been due to an undersea wave.

A 1966 study by the U.S. Navy noted that "The passage of large-amplitude internal waves could make submarine depth control difficult, particularly when the submarine is running quietly at low speed." ...