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


(3.1) Manned submersible craft 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 device 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;
(3.1.8) be equipped with a device for the early detection of water leakage into the pressure hull or any other compartment;
(3.1.9) be equipped (in the case of an autonomous submersible craft) with an effective bilge pumping system;
(3.1.10) be equipped (in the case of an autonomous submersible craft) with such anchors and cables as are sufficient in number, weight and strength having regard to the size and intended service of the craft.

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Source: https://www.legislation.gov.uk/uksi/1981/1098/schedule/1/paragraph/3 (the official version)
Page: https://openlegislation.uk/merchant-shipping-submersible-craft-construction-and-survey-regulations-1981/schedule-1/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.