Chains and marine apparatus moored or anchored by chains to the sea bed

Claim 1

MARINE APPARATUS COMPRISING A BUOYANT VESSEL, A PLURALITY OF CHAINS ANCHORING THE APPARATUS TO AN UNDERWATER BED, AT LEAST SOME OF SAID CHAINS BEING ARRANGED AT AN ANGLE TO THE VERTICAL, HOLLOW STANCHIONS SECURED TO THE VESSEL, A PLATFORM MOUNTED ON THE UPPER ENDS OF SAID STANCHIONS AND TUBES MOUNTED IN SAID STANCHIONS, THE OUTSIDE DIAMETER OF SAID TUBES BEING SUBSTANTIALLY SMALLER THAN THE INSIDE DIAMETER OF SAID STANCHIONS AND THE LOWER ENDS OF THE TUBES BEING WELDED TO THE WALLS OF THE ASSOCIATED STANCHIONS TO PROVIDE BUOYANT WATER-TIGHT ANNULAR CHAMBERS THEREIN, WHEREIN AT LEAST SOME OF SAID CHAINS EXTEND DOWNWARDS THROUGH SAID TUBES AND THE VESSEL AND AT LEAST THE LOWER END PORTIONS OF THE STANCHIONS ARE SUBMERGED AND DISPLACE A VOLUME OF WATER HAVING A WEIGHT IN EXCESS OF THE WEIGHT OF THE VESSEL, STANCHIONS AND PLATFORM IN AIR, AND EACH CHAIN COMPRISES A PLURALITY OF METAL LINKS COUPLED TOGETHER, AT LEAST SOME OF SAID LINKS, INCLUDING LINKS AT SPACED INTERVALS ALONG THE CHAIN, BEING PROVIDED WITH INTERNAL CAVITIES HAVING SUCH A VOLUME THAT, UPON IMMERSION OF THE CHAIN IN WATER, THE WEIGHT OF THE