Diving Methodology

The Wessex Archaeology dive team consisted of five team members: archaeological supervisor; diving supervisor; diver; standby diver and tender. All divers held commercial diving qualifications.
 
The diving support vessel EMU Surveyor was hired for all diving fieldwork in the ALSF project "Wrecks on the Seabed". Access to the water was provided by a transom gate and diving ladder at the stern.
 
Surface Supplied Diving Equipment was used throughout the project. The air supply on board consisted of four 300bar 50l J-cylinders.
 
The air supply was controlled with a DIVEX two diver panel with integrated pneumofathometers. An AMRON communication box was used for diver communication.
 
Divers were linked to the surface by umbilicals which included air supply, pneumo tube, communication, light and camera cables. Standard KMB 28 band masks with neoprene hoods were used. Faceplate mountings held video camera and light.
 
Underwater recording was carried out using the hat mounted camera, handheld digital stills camera and by making measured sketches on drafting film. Watch an extract of the footage (opens your media player, MPEG1, 1.3Mb).
 
For each dive the wreck was marked with a buoy, before anchoring the vessel on a two point mooring for the duration of the dive. If longer fieldwork was planned, a shot was secured to a part of the wreck.
 
Due to strong tidal currents in the area, diving was only carried out in slack water periods.