Systems and processes for closing openings in marine vessel hulls are
provided. The systems and processes facilitate repairs and maintenance of
marine vessels by closing openings in the marine vessel hulls to permit
dry access to compartments in communication with the openings. The
processes and systems incorporate a cover constructed from a lightweight
material such as fiberglass, a viscoelastic material such as polyethylene
or polyurethane, and blends thereof. The cover is guided in place to
effectuate closure of the opening by a track device that receives at
least two of the peripheral edges of the cover and directs the cover to
the proper position to close the hull opening. The cover may be lowered
into place by use of a hoisting device such as a davit.