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The United Kingdom, Japan and the United States sign the London Naval Treaty regulating submarine warfare and limiting shipbuilding.
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London Naval Treaty
1930 international arms control treaty
The London Naval Treaty, officially the Treaty for the Limitation and Reduction of Naval Armament, was an agreement between the United Kingdom, Japan, France, Italy, and the United States that was signed on 22 April 1930. Seeking to address issues not covered in the 1922…Source: Wikipedia (CC BY-SA)
Submarine
Watercraft capable of independent underwater operation
A submarine is a watercraft capable of independent operation underwater. The term "submarine" is also sometimes used historically or informally to refer to remotely operated vehicles and robots, or to medium-sized or smaller vessels. Submarines are referred to as boats rather…Source: Wikipedia (CC BY-SA)
Shipbuilding
Construction of ships and floating vessels
Shipbuilding is the construction of ships and other floating vessels. In modern times, it normally takes place in a specialized facility known as a shipyard. Shipbuilders, also called shipwrights, follow a specialized occupation that traces its roots to before recorded history.Source: Wikipedia (CC BY-SA)