# The Merchant Shipping (Submersible Craft Construction and Survey) Regulations 1981, Paragraph 6: Communications


(6.1) One man submersible craft and atmospheric diving suits shall be fitted with such equipment as is necessary for the submersible craft to communicate with its parent craft when on the surface and when submerged. Equipment using through water communication methods shall have a minimum range of twice the maximum operating depth of the craft.
(6.2) Where main communications are transmitted through the umbilical, emergency through water means of communication shall also be provided.

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Source: https://www.legislation.gov.uk/uksi/1981/1098/schedule/2/paragraph/6 (the official version)
Page: https://openlegislation.uk/merchant-shipping-submersible-craft-construction-and-survey-regulations-1981/schedule-2/paragraph-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.