The Royal Navy has been orchestrating the largest international war games exercises to take place in the south-west for many years.
Dutch vessel HNLMS Evertsen was one of the ships to take part in the famous 'Thursday War'.
From dealing with casualties and fires to protecting a 'mission essential unit', all of its crew's skills were put to the test - and all while speaking in a second language.
In this case, they had to get the USS Robert E Peary safely to harbour by 2pm, while searching for their fellow countrymen in the Dutch submarine Bruinvis.
The boat was playing an enemy submarine. Not before long, the tell-tale periscope gave the game away.
It's all part of Flag Officer Sea Training, with the Evertsen here for international sea exercises ahead of deploying later this year.
17 different nationalities are taking part, including the Dutch, Spanish, Estonians and Americans.
Next, Evertsen will take part in a humanitarian disaster exercise, before deploying to the Caribbean in support of NATO's war on drugs.