Plate 6.1 Archaeological team on surface supply preparing to dive. The supervisor (centre) reads out the pre-dive checks;
the divers, assisted by their tenders (wearing life-jackets) confirm that each check is OK. The divers carry emergency bale-
out bottles and have through-water communication with the surface. (Photo: Edward Martin)Plate 6.2 A commercial archaeological diving unit working to UK Health and Safety Executive protocols for surface-
supplied diving. The supervisor is in the cabin, where he is in voice communication with the diver, whose progress he
monitors via a helmet-mounted video link. A tender monitors the diver’s umbilical, while behind is the standby diver,
fully kitted-up except for his mask. (Photo: Colin Martin)9781405175913_7_Plates 5/7/08 6:26 PM Page 5