Spirit of Discovery, leading to over 100 injuries and one fatality. The voyage had weather forecasts, checklists and a risk assessment.
It had no framework for saying no.
On 4 November 2023, Spirit of Discovery lost propulsion in heavy weather while crossing the Bay of Biscay.
The vessel’s violent motion caused both propulsion pods to overspeed and shut down.
The result was 115 injured passengers.
One passenger later died.
The obvious explanation sits in the machinery.
The pods tripped.
The propulsion control system then parked both pods at 90° to the vessel’s heading.
Steerage was lost. The vessel’s motion became worse.
But the machinery failure did not begin the management problem.
Before the crossing, the risk assessment covered weather routing, passenger injuries and preserving propulsion.
Heavy-weather checklists were completed.
Updated forecasts predicted winds up to force 11 and waves between 7m and 13m.
The revised routing guidance strongly advised against crossing the Bay of Biscay.
Still, the decision was not effectively challenged onboard or ashore.
Why?
The captain relied optimistically on the shipbuilder’s seakeeping and manoeuvring decision support poster.
The poster offered prediction.
The operation lacked detailed weather and vessel-motion limits.
Without those limits, there was no agreed threshold that converted a forecast into a stop, delay or escalation.
Challenge remained possible.
But it depended on somebody opposing the captain’s interpretation without a defined operational boundary behind them.
That is a weak control under pressure.
The propulsion risk was not entirely new either.
Pod overspeed shutdown in heavy weather had occurred eight months earlier. The manufacturer had advised that it could happen again.
Yet the operating instructions did not warn the crew correctly about the risk of losing propulsion in heavy weather.
So the vessel crossed with paperwork describing the risk, but without the technical limits needed to control it.
For a DPA, completed preparation is not enough.
Ask what changes the decision.
Which forecast value triggers formal reassessment?
Which vessel motion stops the passage?
Who ashore must challenge the plan?
What authority do they have when the master remains confident?
A risk assessment can identify heavy weather.
Only an operational limit tells the organisation when confidence must give way.
Where does your SMS turn deteriorating forecasts into a mandatory decision point?
#MaritimeSafety #MarineAccidentInvestigation #RiskAssessment #MachineryFailure #BridgeResourceManagement
