Page 163 - Engineering in Nature

reat numbers of engineers and scientists employ ad-

vanced technologies in the manufacture of present-
day submarines. Their aim is to produce machines
that can stay longer underwater, with a greater ca-
pacity for movement with the expenditure of less
energy. Yet despite all these studies and the bringing
together of all their efforts, all they have achieved is a ship that can
move forward underwater and rise and dive as required.
In addition, submarines must be made of very strong metals in
order to resist the high pressures underwater. Inside, a large area has
to be set aside for storing provisions and materials that let their pas-
sengers survive on the sea bed. Work is continuing, with intense ef-
forts to resolve problems and improve the technology used in these