A Surface-Powered Fibre-Tether Cryobot for Europa: Conductor Loss, Tether Mass and High-Bandwidth Descent 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 cryobot is a civilian science probe for reaching Europa's ocean with a live high-bandwidth link for imaging and chemistry measurements; it carries scientific instruments only. Headline computed outcomes are conductor loss of 2,389 watts, descent rate of 34.3 metres per day and tether mass of 4,650 kilograms. 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.