It is possible to envision a hybrid aerospace-undersea craft (HAUC), which due to the physical mechanismsenabled with an inertial mass reduction device, can function as a submersible craft capable of extremeunderwater speeds (lack of water-skin friction due to electromagnetic field-induced water moleculesrepulsion) and enhanced stealth capabilities (non-linear scattering of radio frequency and sonar signals).This hybrid craft would move with ease through the air, space, water mediums, by being enclosed in a bubble(shield), generated due to the coupled effects of electromagnetic field induced air/water particles repulsionand vacuum energy polarization. Moreover, it may be possible to reduce the inertial mass of a system/objectin motion, by applied high energy electromagnetic fields, achieved by a novel coupling of accelerated highfrequency vibration with accelerated spin of electrically charged matter in close proximity to thesystem/object in question. This original method of accelerated spin/accelerated vibration of charged matterwould be executed under rapid acceleration transients for maximum effect. The resultant high energy flux(on the order of 10 Watts/m²) when concentrated in a small area around the contour of the object (craft) cangenerate energy densities of 10 Joules/m, commensurate with Schwinger electric field values for vacuumpolarization. As a result, extreme craft speeds can be achieved, thus enabling a novel method of advancedpropulsion.