NOVELTY - The system (200) has a cooling water intake conduit comprising a water intake in a submerged area of an open natural body of water. A water-to-water heat exchanger (203) has a side that is in fluid communication with the cooling water intake conduit. A closed water loop is in fluid communication with other side of the water-to-water heat exchanger and is arranged to route water to cooling structures at a modular computer data center (202). The cooling water intake conduit descends into the open natural body of water from a platform (204) i.e. cargo ship, floating in the open natural body.    USE - Wave-power based floating data center system for use in a ship i.e. seagoing ship such as freighter.    ADVANTAGE - The system beneficially permits for more ready deployment of data centers to areas in need of computing or telecommunications power, so that the data centers can be quickly and inexpensively constructed in modular units such as standard shipping containers. The system enables replacement of old modules with new modules as the old modules quickly wear out under adverse sea conditions. The system can be more readily transported and implemented without significant or specialized training by the utilization of standard shipping containers whose transportation is well known to most dock workers and seamen. The system can be quickly deployed so as to be applied in areas requiring quick computing or telecommunication power such as areas of military conflict or disaster areas. The system works based on wave power, so that the data center modules can be operated without being connected to external utilities.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for maintaining a computer data center.    DESCRIPTION OF DRAWING(S) - The drawing shows a side view of a floating data center system.    Wave-power based floating data center system (200)    Modular computer data center (202)    Water-to-water heat exchanger (203)    Platform (204)    Cooling towers (205A, 205B)