4. In regulation 2 of the Offshore Installations (Safety Case) Regulations 1992(1), in paragraph (1) the definition of “diving bell” shall be deleted and the following substituted—
““diving bell” means any compression chamber which is capable of being manned and is used or designed for use under the surface of water in supporting human life being a chamber in which any occupant is or may be subjected to a pressure of more than 300 millibars above atmospheric pressure during normal operation;”.