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A fluid-driven electricity generator includes a stator assembly and a rotor assembly. The stator assembly includes a stator core that includes a plurality of stator windings and one or more stator turbines connected to the stator core. The one or more stator turbines are configured to rotate in a fi

A fluid-driven electricity generator includes a stator assembly and a rotor assembly. The stator assembly includes a stator core that includes a plurality of stator windings and one or more stator turbines connected to the stator core. The one or more stator turbines are configured to rotate in a first direction. The rotor assembly includes a plurality of permanent magnets that are substantially surrounded by the stator core. The rotor assembly also includes one or more rotor turbines connected to the plurality of permanent magnets. The one or more rotor turbines are configured to rotate in a second direction that is opposite the first direction.

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1. A fluid-driven electricity generator comprising: a stator assembly; wherein the stator assembly comprises: a stator core that includes a plurality of stator windings; andone or more stator turbines connected to the stator core, wherein the one or more stator turbines are configured to rotate in a

1. A fluid-driven electricity generator comprising: a stator assembly; wherein the stator assembly comprises: a stator core that includes a plurality of stator windings; andone or more stator turbines connected to the stator core, wherein the one or more stator turbines are configured to rotate in a first direction;a rotor assembly, wherein the rotor assembly comprises: a plurality of permanent magnets, wherein the plurality of permanent magnets are substantially surrounded by the stator core; andone or more rotor turbines connected to the plurality of permanent magnets, wherein the one or more rotor turbines are configured to rotate in a second direction that is opposite the first direction; anda throttle control module, wherein the throttle control module comprises: a housing; andan umbrella bladder that is configured to elongate and retract within the housing. 2. The generator of claim 1, wherein the generator further comprises a body that includes at least one buoyancy chamber. 3. The generator of claim 2, wherein the buoyancy chamber has a fixed volume of fluid. 4. The generator of claim 1, wherein the generator further comprises: a body;dorsal fins; andlateral fins. 5. The generator of claim 4, wherein the dorsal and lateral fins are adjustable. 6. The generator of claim 1, wherein the one or more rotor turbines are variable-pitch turbines. 7. The generator of claim 6, wherein the one or more stator turbines are variable-pitch turbines. 8. The generator of claim 1, wherein the umbrella bladder comprises an upstream face, a downstream face and a plurality of braces. 9. The generator of claim 8, wherein the throttle control module further comprises a hydraulic piston connected to the upstream face. 10. The generator of claim 9, further comprising: an umbilical, wherein the umbilical connects the generator to a power facility; andan onboard computer, wherein the onboard computer is configured to control the operation and orientation of the generator. 11. An underwater electric generator system comprising: an electric generator, wherein the electric generator is buoyant;a power facility;an umbilical connecting the generator to the power facility; anda throttle control module that comprises: a housing; andan umbrella bladder that is configured to elongate and retract within the housing. 12. The generator system of claim 11, wherein the generator comprises: a stator assembly; wherein the stator assembly comprises: a stator core that includes a plurality of stator windings; andone or more stator turbines connected to the stator core, wherein the one or more stator turbines are configured to rotate in a first direction;a rotor assembly, wherein the rotor assembly comprises: a plurality of permanent magnets, wherein the plurality of permanent magnets are substantially surrounded by the stator core; andone or more rotor turbines connected to the plurality of permanent magnets, wherein the one or more rotor turbines are configured to rotate in a second direction that is opposite the first direction. 13. The generator system of claim 12, wherein the generator further comprises a body that includes at least one buoyancy chamber that includes a fixed volume of fluid. 14. The generator system of claim 13, wherein the generator further comprises: a body;dorsal fins; andlateral fins. 15. The generator system of claim 14, wherein the one or more rotor turbines and one or more stator turbines are variable-pitch turbines. 16. The generator system of claim 11, wherein the generator further comprises an onboard computer, wherein the onboard computer is configured to control the operation and orientation of the generator. 17. The generator system of claim 16, wherein the onboard computer is configured to control the dorsal fins, the lateral fins and the throttle control module. 18. A fluid driven generator: a stator assembly; wherein the stator assembly comprises: a stator core that includes a plurality of stator windings; andone or more stator turbines connected to the stator core, wherein the one or more stator turbines are configured to rotate in a first direction;a rotor assembly, wherein the rotor assembly comprises: a plurality of permanent magnets, wherein the plurality of permanent magnets are substantially surrounded by the stator core; andone or more rotor turbines connected to the plurality of permanent magnets, wherein the one or more rotor turbines are configured to rotate in a second direction that is opposite the first direction;an onboard computer; anda throttle control module that comprises: a housing; andan umbrella bladder that is configured to elongate and retract within the housing, wherein the position of the umbrella bladder is controlled by the onboard computer. 19. The electric generator of claim 18, wherein the electric generator further comprises: a body;dorsal fins attached to the body, wherein the dorsal fins are configured to adjust the yaw of the generator body;lateral fins attached to the body, wherein the lateral fins are configured to adjust the pitch and roll of the generator body; andwherein the dorsal fins and lateral fins are controlled by the onboard computer.