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MRLN-XR · Subsea autonomy

Marlin-XR Seabed Survey AUV

An autonomous underwater vehicle surveying the export-cable corridor of the Dogger Bank offshore wind farm. The bundled demo ledger: forty items seeded across all eleven lifecycle stages, from the mission brief to the deployment procedure.

The System Ledger canvas in DjiniousEngineering: eleven ISO 15288 stage columns from Mission & Need to Production & Operation, each column holding typed items with their artifact type, evidence class and validation state, and the review gates between stages.The System Ledger canvas in DjiniousEngineering: eleven ISO 15288 stage columns from Mission & Need to Production & Operation, each column holding typed items with their artifact type, evidence class and validation state, and the review gates between stages.
Typed items across all eleven stages. Each carries its artifact type, evidence class, revision and validation state; the gates sit between the stages.Seeded demo ledger · UK Continental Shelf — Dogger Bank
40
ledger items
11
lifecycle stages
5
steps on the path
4
standards applied
STANDARDS

What this class is held to

The recipe for this system class encodes its standards as tracked obligations, so the design is proven against them rather than tested against them at the end.

  • MCA MGN 664
  • IMCA S 019
  • Marine Licence (MMO)
  • UNCLOS Art. 60/80
THE MISSION NEED

One dive, a fixed corridor, and no room to be wrong at 300 m

The mission brief is exact: autonomous survey of a 12 km export-cable corridor on Dogger Bank to 300 m depth, ≥ 8 h endurance, ≤ 0.5 m bathymetry resolution, one-dive coverage. Endurance, resolution and coverage pull against each other; the vehicle has to close all three at once, and every choice that gets it there has to be traceable back to that brief and forward to a test that proves it.

THE PATH

Baseline lifecycle, vehicle recipe

Carry the mission need to a released Technical Data Package: derive verifiable requirements, trade three hull architectures, converge the energy and hydrodynamic budgets, prove the models against a digital replica, then freeze the baseline.

  1. 01Frame the mission need and derive singular, verifiable requirements (endurance, resolution, coverage)
  2. 02Trade three architectures — Torpedo AUV, Open-frame hover, Hybrid glider-hover — scored on endurance 0.35, manoeuvre 0.30, payload 0.20, cost 0.15
  3. 03Record the decision: adopt the hybrid glider-hover configuration
  4. 04Converge the sizing loop — a 12.6 kWh battery pack against the ≥ 8 h endurance budget
  5. 05Close verification, freeze the baseline, and emit the Technical Data Package

Seeded demo ledger

THE GATE

PDR — Preliminary Design Review

The agent cannot pass PDR until a human has validated the items upstream of it and the platform's criteria are met.

  • The sizing loop has converged
  • Margins against every hard constraint are positive
  • Every requirement traces to an architecture element that implements it
  • A verification method is assigned to each requirement

The gate is a ledger item the agent cannot walk past — it stops an autonomous run from designing on top of an unreviewed baseline.

IN THE PLATFORM

On the canvas

The System Ledger read as a linear notebook in DjiniousEngineering: each typed item in produces order, showing its artifact type and the item it derived from.The System Ledger read as a linear notebook in DjiniousEngineering: each typed item in produces order, showing its artifact type and the item it derived from.
The same thread read straight through — every item in produces order, each one naming its parent.
A requirements traceability table in DjiniousEngineering: requirements derived from needs, allocated to components and closed by verification, each row showing its evidence class and validation state.A requirements traceability table in DjiniousEngineering: requirements derived from needs, allocated to components and closed by verification, each row showing its evidence class and validation state.
Traceability as rows you can walk: derive, allocate, verify — with an evidence class on every one.
MORE CASES

Bring a subsea autonomy system you actually build.

We will frame the need, derive the requirements, stand up the ELANG model and walk a review gate with you on the call.

Book a demo