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Embodiments of a buoyancy dissipater and method for deterring a vessel are generally described herein. In some embodiments, a volume of gas is generated from a propellant and diffused below a waterline of a vessel. The resulting gas bubble dissipates the buoyancy of the vessel providing a non-lethal

Embodiments of a buoyancy dissipater and method for deterring a vessel are generally described herein. In some embodiments, a volume of gas is generated from a propellant and diffused below a waterline of a vessel. The resulting gas bubble dissipates the buoyancy of the vessel providing a non-lethal deterring effect.

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What is claimed is: 1. A buoyancy dissipater comprising: propellant; a gas generator to generate a volume of gas from the propellant; a diffuser having diffusion ports to radially diffuse the gas generated by the gas generator below a waterline of a vessel to dissipate buoyancy of the vessel; prope

What is claimed is: 1. A buoyancy dissipater comprising: propellant; a gas generator to generate a volume of gas from the propellant; a diffuser having diffusion ports to radially diffuse the gas generated by the gas generator below a waterline of a vessel to dissipate buoyancy of the vessel; propellant charge-size control circuitry to control a propellant charge size to change an amount of the propellant that is to be ignited to vary an amount of gas to be generated by the gas generator. 2. The buoyancy dissipater of claim 1 wherein the propellant charge-size control circuitry allows the propellant charge size to be selected by a user based on a size estimate of the vessel. 3. The buoyancy dissipater of claim 1 further comprising a plurality of igniters to control the amount of the propellant that is to be ignited to vary the volume of the gas that is generated, wherein each igniter is to ignite separate portions of the propellant. 4. The buoyancy dissipater of claim 1 wherein the propellant comprises an air-bag generant. 5. The buoyancy dissipater of claim 1 wherein the diffusion ports allow the gas generated by the gas generator to escape during gas generation and diffuse below the waterline. 6. The buoyancy dissipater of claim 5 wherein the diffusion ports comprise holes positioned radially around the diffuser to diffuse the gas radially with respect to the buoyancy dissipater. 7. The buoyancy dissipater of claim 1 further comprising a fuze to initiate detonation of the propellant. 8. A buoyancy dissipater comprising: propellant; a fuze to initiate detonation of the propellant; a gas generator to generate a volume of gas from the propellant; a diffuser to diffuse the gas generated by the gas generator below a waterline of a vessel to dissipate buoyancy of the vessel; fuze circuitry responsive to the fuze; control circuitry to provide an ignition signal to an igniter for igniting the propellant in response to an indication from the fuze circuitry; a charge size selector to allow selection of a propellant charge size by a user; and a propellant control element responsive to the selection of the propellant charge size to control an amount of propellant to be ignited, wherein the selection of the propellant charge size varies the volume of the gas that is generated. 9. The buoyancy dissipater of claim 8 further comprising a delivery shell to contain the buoyancy dissipater. 10. The buoyancy dissipater of claim 9 wherein the delivery shell is gun-launched. 11. An errant-vessel deterring apparatus comprising: a gas generator including an igniter to ignite a propellant to generate a volume of gas; a diffuser comprising a plurality of diffusion ports to diffuse the volume of gas below a waterline of a vessel to dissipate buoyancy of the vessel; a pressure cylinder to provide a region within the buoyancy dissipater to allow the propellant to burn and expand after ignition; ballast to maintain the buoyancy dissipater below the waterline; a fuze to initiate detonation of the propellant; a delivery shell to contain the gas generator, the diffuser, the pressure cylinder, the ballast and the fuze; and propellant charge-size selection control circuitry to allow a propellant charge size to be selectable by a user based on a size estimate of the vessel, wherein the delivery shell is gun-launched toward the vessel, and wherein the fuze initiates detonation upon impact of the delivery shell with the waterline for detonation of the propellant after a predetermined period of time or upon detection of the vessel. 12. The apparatus of claim 11 wherein the diffusion ports comprise holes positioned radially around the diffuser to allow the gas to diffuse radially, and wherein the propellant comprises an air-bag generant. 13. A method for deterring a vessel with a buoyancy dissipater, the method comprising: selecting a propellant charge size based on a size estimate of the vessel; initiating a rapid generation of gas by igniting a propellant; and radially diffusing the gas below a waterline of the vessel to generate a gas bubble to dissipate the buoyancy of the vessel, wherein selecting the propellant charge size varies a volume of the gas that is generated. 14. The method of claim 13 further comprising: launching a delivery shell from above the waterline of the vessel, the delivery shell containing the buoyancy dissipater, the buoyancy dissipater to travel below the waterline toward the vessel; initiating detonation upon impact of the delivery shell with the waterline; and igniting the propellant after a predetermined period of time after impact with the waterline or upon detection of the vessel. 15. A method for deterring a vessel with a buoyancy dissipater, the method comprising: launching a delivery shell from above a waterline of the vessel, the buoyancy dissipater to travel below the waterline toward the vessel; initiating detonation upon impact of the delivery shell with the waterline; igniting a propellant after a predetermined period of time after impact with the waterline or upon detection of the vessel to initiate a rapid generation of gas; diffusing the gas below the waterline of the vessel to generate a gas bubble to dissipate buoyancy of the vessel; and providing for user selection of a propellant charge size based on a size estimate of the vessel, wherein the selection of the propellant charge size varies a volume of the gas that is generated.