Buoyancy-Assisted Pulsed-Controlled Autonomous Advancement (BAPCAA): An Energy-Efficient and Low-Observability Advancement Mode for Submarines

This work presents Buoyancy-Assisted Pulsed-Controlled Autonomous Advancement (BAPCAA), a software-defined advancement mode for submarines that reframes propulsion, endurance, and stealth as operational behaviors rather than hardware-limited properties. BAPCAA combines buoyancy-assisted glide phases with intermittent, pulsed propulsion and autonomous control to deliberately reduce propulsion duty cycle while preserving navigational accuracy. Instead of relying on continuous thrust or additional onboard energy storage, the approach trades time for energy efficiency and reduced cumulative acoustic exposure, enabling endurance-first and low-observability operation using existing submarine platforms. Analytical models quantify energy consumption, speed trade-offs, and acoustic exposure, showing that even modest duty-cycle reductions can yield substantial endurance and stealth-persistence gains. Positioned as an on-demand software mode rather than a new submarine architecture, BAPCAA offers a scalable and immediately deployable pathway for extending submarine mission capability under fuel-constrained, patrol, or unexpected stealth-critical conditions. Why miss the free ride? Buoyancy.