13. A licence holder must ensure that(1) radio communications with the vessels and platforms near the drilling installation are maintained;
(2) an escape route is established from each work station and is accessible to every person present therein;
(3) the manuals and any documents needed for the safe performance of the work are readily available on each vessel or platform; and
(4) a helideck of an installation is easily accessible from the work stations and any accommodation for the personnel in the installation.