An Autonomous Propeller-Driven Submersible for Callisto's Ocean: Drag, Propulsion and Survey Endurance Budget

This paper presents a complete sizing study of the system in its title, built from named physical relations applied to a stated set of environmental inputs, with all results labelled SIMULATED, NOT MEASURED. The submersible is a civilian science vehicle for surveying the ocean of Callisto and measuring its temperature, salinity and currents; it carries cameras, sonar and water samplers only. Headline computed outcomes are operating pressure of 139.7 megapascals, reserve buoyancy of 45 kilograms and endurance of 185.4 hours. Because every figure traces to the deposited script, a reader who disputes an input can re-run the whole argument with a different one and see exactly which conclusions move.