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An improved structure adapted for undersea construction is described comprising a plurality of foundation blocks, each foundation block comprising a rectahedral parallelepiped opposite faces of which are concave and convex, respectively, the opposite faces being sized and shaped to interengage matin

An improved structure adapted for undersea construction is described comprising a plurality of foundation blocks, each foundation block comprising a rectahedral parallelepiped opposite faces of which are concave and convex, respectively, the opposite faces being sized and shaped to interengage matingly, such foundation blocks being interfitted into a three-dimensional array; a plurality of base pad units supporting said foundation blocks, each base pad unit comprising a rectahedral parallelepiped one face of which is convex, the opposite face of which has a plurality of protruding lugs, and the intermediate faces of which have T-shaped slots extending the length of each side, such base pad units being interfitted into a two-dimensional array by means of I-shaped keys which fit into adjacent T-shaped slots; a plurality of leg blocks supporting said base pad units, each of said leg blocks comprising a rectangular parallelepiped one face of which is convex, the opposite face of which is concave, the opposite faces being sized and shaped to interengage matingly, and the intermediate faces of which have T-shaped slots in each side, such plurality of leg blocks being interfitted into a three-dimensional array by means of the mating concave-convex faces in one direction and by means of T-shaped key assemblies which fit into adjacent T-shaped slots in the other two directions, some of said leg blocks interengaging matingly with some of said foundation blocks by means of interengaging, mating convex and concave faces. The key assemblies comprise four T-shaped keys symmetrically mounted on a planar base. The heads of said T-shaped keys extend perpendicularly to the plane of said planar base and fit into T-shaped slots in adjacent leg blocks. Specific structures of each of the components are also described.

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An undersea platform construction comprising: (a) a plurality of foundation blocks, each of said foundation blocks comprising a rectahedral parallelepiped opposite faces of which are concave and convex, respectively, the opposite faces being sized and shaped to interengage matingly, said foundation

An undersea platform construction comprising: (a) a plurality of foundation blocks, each of said foundation blocks comprising a rectahedral parallelepiped opposite faces of which are concave and convex, respectively, the opposite faces being sized and shaped to interengage matingly, said foundation blocks being interfitted into a three-dimensional array; (b) a plurality of base pad units supporting said foundation blocks, each of said base pad units comprising a rectahedral parallelepiped one face of which is convex, the opposite face of which has a plurality of protruding lugs, and the intermediate faces of which have T-shaped slots extending the length of each side, said base pad units being interfitted into a two-dimensional array by means of I-shaped keys which fit into adjacent T-shaped slots; (c) a plurality of leg blocks supporting said base pad units, each of said leg blocks comprising a rectangular parallelepiped one face of which is convex, the opposite face of which is concave, the opposite faces being sized and shaped to interengage matingly, and the intermediate faces of which have T-shaped slots in each side, said plurality of leg blocks being interfitted into a three-dimensional array by means of the mating concave-convex faces in one direction and by means of T-shaped key assemblies to be recited which fit into adjacent T-shaped slots in the other two directions, some of said base pad units interengaging matingly with some of said foundation blocks by means of interengaging, mating convex and concave faces; and (d) a plurality of key assemblies, each of said key assemblies comprising four T-shaped keys symetrically mounted on a planar base, the heads of said T-shaped keys extending perpendicularly to the plane of said planar base and fitting into T-shaped slots in adjacent leg blocks.