(57) An underwater facility has of a buoyant platform (1), having a through-hole (8),
the hole's diameter is slightly bigger than the size of a human head, the hole employs
an underwater observation device, the observation device consists of a transparent
viewing chamber (6), the chamber protruding the bottom of the buoyant platform and
means (7) to secure the viewing chamber in the correct position to said hole and in
said hole, enabling an observer to lie in a prone position on the buoyant platform
with at least his face resting in the transparent viewing chamber.
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