Design Blueprint: A Surface-Powered Fibre-Tether Cryobot for Europa: Conductor Loss, Tether Mass and High-Bandwidth Descent Budget

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24207208): 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. Status: DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. All numbers are simulated values from the source paper's computation, deposited with this blueprint as compute.py and results.json. The design is a civilian science access and exploration system for subsurface oceans and has no targeting or weapon application. AI-use disclosure: Dave, an AI research system, assisted with the computation and drafting under the author's direction; author of record William Alexander Aldred.