Apparatus for cleaning or maintaining the outer side of a hull or the inner side of a cargo hold of a marine vessel with improved attachment capacity

An apparatus for cleaning or maintaining the outer side of a hull or the inner side of a cargo hold of a marine vessel, said apparatus comprising:

• a housing provided with;
• a first row of magnetic driving and attachment elements, said first row of magnetic driving and attachment elements comprising a first driven continuous track with magnetic links, and
• a second row of magnetic driving and attachment elements, said second row of magnetic driving and attachment elements comprising a second driven continuous track with magnetic links,
• said first driven continuous track being configured for providing a first magnetic adherence to the outer side of the hull or the inner side of the cargo hold of the marine vessel,
• said second driven continuous track being configured for providing a second magnetic adherence to the outer side of the hull or the inner side of the cargo hold of the marine vessel,
• said first and second row being parallel and arranged at opposing lateral sides of said housing,
• at least one suspended magnetic wheel at least partially arranged between said first row and said second row, said at least one suspended magnetic wheel being suspended from said housing and biased towards said housing and configured to provide a third magnetic adherence to the outer side of the hull or the inner side of the cargo hold of the marine vessel, in addition to the first magnetic adherence and the second magnetic adherence, at a position between the first driven continuous track and the second driven continuous track.