# The Merchant Shipping (Submersible Craft Construction and Survey) Regulations 1981, Paragraph 3: Control


(3.1) One man submersible craft and atmospheric diving suits shall, where appropriate:—
(3.1.1) contain valves, gauges and such other equipment as is necessary to control the propulsion and auxiliary systems, including any fuel supply and exhaust systems;
(3.1.2) contain such equipment as is necessary to control the direction of the craft in azimuth;
(3.1.3) contain such valves, gauges and other equipment as are necessary to control the depth, attitude, and rate of descent and ascent without inducing resonant or unstable motions;
(3.1.4) be fitted with jettisonable weights or other means, suitably protected against inadvertent operation, to achieve positive buoyancy in an envisaged emergency situation;
(3.1.5) be fitted with valves or other fittings to enable manipulators, grasping or anchoring devices and jettisonable equipment to be released in a planned or envisaged emergency situation;
(3.1.6) be fitted with an umbilical capable of maintaining services and of sufficient strength for its intended service;
(3.1.7) be equipped with an internal release suitably protected against inadvertent operation, for severing or releasing the umbilical cable. In the case of a towed submersible craft similar arrangements should be provided for the towing cable.

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Source: https://www.legislation.gov.uk/uksi/1981/1098/schedule/2/paragraph/3 (the official version)
Page: https://openlegislation.uk/merchant-shipping-submersible-craft-construction-and-survey-regulations-1981/schedule-2/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.