Tension link for drill floor substructure assembly

A drilling rig, comprising:

• a collapsible substructure including:
• a side top box;
• a center section connectable to the side top box;
• and,
• a drill floor formed on a top side of the side top box and a top side of the center section;
• a first link element formed on the upper surface of the side top box;
• a second link element formed on the upper surface of the center section;
• the first link and second link elements being located in adjacent alignment when side top box and center section are positioned for connection to each other;
• a substantially oval tension link connectable to the first and second link elements;
• and,
• a latch mechanism for preventing upward movement of the tension link assembly in relation to the drill floor, the latch mechanism comprising:
• a handle;
• a latch;
• and,
• a connector connecting the handle and the latch, and being insertable between the first and second link elements;
• wherein forces urging separation of the first and second link elements are resisted by the tension link.