The most widespread noise-generating activity in the ecoregion is shipping.
This produces relatively low‑frequency continuous sound that will affect most
of the ecoregion.
Noise generated by military activities in the ecoregion will
include some continuous sound from vessels, as well as low- and mid-frequency impulsive
sounds from sonar used to find submarines and in a few cases from explosives.
These sounds have been known to lead to the deaths of marine mammals,
especially beaked whales. The scale of the military activities is not known,
but not likely to be great.