sentences:  A small number of holes in the ice can provide access over a large area and high levels of experimental replication.Divers are a flexible and reliable method for deploying, maintaining and retrieving equipment from under‐ice environments, and are relatively cost efficient for researching remote locations that, would otherwise require the use of more expensive research vessels.The global threat to marine ecosystems due to over‐exploitation, habitat loss, pollution and climate change is exacerbated by introduction of alien species, which is considered to be one of the leading causes of extinctions and biodiversity loss.