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64
BRITISH KINEMATOGRAPHY
Vol. 23, No. 3
200 ft. A search of about an hour covered most of the surface and showed that it was a smooth, featureless sand hillock, devoid of even marine life with the exception of a solitary crab. These formations occur frequent!) in the Channel. Investigation by bottom sampler reveals their nature but not the detailed structure or configuration of the surface.
Another example o\" a sand formation occurred in the vicinity of Smith's Knoll where a series of regular waves about 15 ft. high and 700 to 800 ft. long was observed by echo-sounder at a depth of about 16 fathoms. The camera showed them to be fine sand, the
survey may be summarised as follows :
(a) The camera is capable of working deeper than a diver and for even longer periods than an observation chamber,
(b) There is no risk of life,
(c) The picture is presented directly to experts on the surface and not by verbal descriptions,
{(I) Manoeuvring is enormously simplified by the direct observation.
The base of manoeuvring renders the use of salvage grabs, etc., relatively simple. It is a fascinating experience to place a diver's shot line, salvage srab or other device, solelv
Fig. 6. The seabed, showing shoal offish on left, picture is by daylight only.
This
surface also bearing the small ripple formation often found on the sea-shore. This fact could not have been ascertained by any method other than diving. As the ship was not even moored for this investigation, the speed and simplicity of the television method is obvious.
The presence, distribution and appearance of rock and weed formations are also most easil) investigated visually since any normal bottom-sampling method is confined to scattered points.
The application to salvage operations was, of course, vividly illustrated by the "Affray" operations. The major advantages in wreck
Fig. 7. The break in the snort mask of the " Affray."
with the aid of the camera, accurately to within a few inches. The sense of intimacy is so great that it is difficult to believe that the object in view is some hundreds of feet below the sea surface.
The inspection of ships' hulls below water, and dock and harbour survey work may be considered together because they present normally similar conditions. The turbid nature of the water in most British harbours means that limited use only is practicable. Some work has been done in an undisturbed non-tidal basin where sedimentation has produced a usable transparency. If, of course, a very limited field of view is required and a