1.—(1) In this Schedule—
“offshore installation” shall be construed in accordance with paragraph 4(2) and (3);
“stand-by vessel” means a vessel which is ready to give assistance in the event of an emergency on or near an offshore installation;
“vessel” includes a hovercraft and any floating structure which is capable of being staffed.
(2) For the purposes of this Schedule, any structures and devices on top of a well shall be treated as forming part of the well.
(3) For the purposes of this Schedule, a person shall be deemed to be engaged in diving operations throughout any period from the time when he commences to prepare for diving until the time when—
(a)he is no longer subjected to raised pressure;
(b)he has normal inert gas partial pressure in his tissues; and
(c)if he entered the water, he has left it,
and diving operations include the activity of any person in connection with the health and safety of a person who is, or is deemed to be, engaged in diving operations.
(4) Any reference in this Schedule to premises and activities (howsoever described) shall include a reference to any person, article or substance on those premises or engaged in or, as the case may be, used or for use in connection with any such activity but does not include a reference to an aircraft which is airborne.