Defense Advanced Research Projects Agency (DARPA) is developing a large, unmanned underwater system named the Hydra that will be configured with modular payloads to clandestinely deploy a mix of UAVs and UUVs. 

The Hydra program will have three phases: 1) define concepts, develop component capabilities, and reduce subsystem risks with one or more contracts in several technical areas; 2) develop and test a full system including UUV mother-ship; 3) test technologies including modular enclosures, air vehicle payloads, undersea payloads, concepts of operation, and supporting technologies.

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DARPA Releases Hydra Broad Agency Announcement

22 August 2013 - Today the Defense Advanced Research Project (DARPA) released the Broad Agency Announcement for the Hydra system.  The BAA is composed of several technical areas with multiple awards possible in each area.

Technical Area 1 is a modular enclosure that will transport, house and launch various payloads and will serve as a payload agnostic “mission truck” to provide basic services and support to the payload module and individual payloads.  Technical Area 2 will be an Air Vehicle Payload is envisioned to consist of individually encapsulated air vehicles within a module that fits into the standard Hydra modular enclosure.  The UAVs will be ejected from the modular enclosure, float to the surface, launch, fly a minimum range and conduct one or more of the missions in a classified annex.  Technical Area 3 consists of an underwater module to safely transport a small number of existing undersea vehicles.  The module will provide the required energy for long endurance, efficiently transferring energy, transfer and transmit collected information, and launch and dock the vehicles.  Technical Area 4 will develop concepts of operation or conduct architecture studies related to the overall Hydra system.  Technical Area 5 will explore various supporting technologies for the Hydra concept.