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DocSavageM4-12 The Hell-Diver

Helldiver is the name of the submarine used by Doc Savage. It is equipped with the latest in scientific equipment for underwater exploration and is unarmed, although it does posses in Death in Silver limited defensive capabilities.

It is described as being the most unique submarine ever constructed and consists of a set of "sledlike runners" that run from the bow to the stern. It was originally constructed for a trip under the North Polar ice.

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