In addition to the diesel engine noise most of these ships are running sonar systems which affect marine mammals https://en.wikipedia.org/wiki/Sonar#Effect_on_m

In addition to the diesel engine noise most of these ships are running sonar systems which affect marine mammals https://en.wikipedia.org/wiki/Sonar#Effect_on_marine_mammals https://en.wikipedia.org/wiki/Sonar#Effect_on_marine_mammals