Why Did 70 Vehicles Burn on the Delphine After CO2 Worked?
MV Delphine lost 60–70 vehicles in the April 2025 Zeebrugge fire even though CO2 suppression worked as designed. Detection timing is the gap.
On 16 April 2025 a fire broke out on the third cargo deck of MV Delphine — CLdN's 239-metre, 8,000-lane-metre short-sea ro/ro and one of the largest of its class in European service — while the vessel was berthed at Zeebrugge. The master closed off the deck and activated the CO2 flooding system. The fire was brought under control. Sixty to seventy vehicles were already gone.
The CO2 system did its job — and 70 vehicles burned anyway
That combination — suppression success, significant cargo loss — is the standard outcome when CO2 activates at the smoke or flame stage. Roughly 100 vehicles were stowed on the affected deck: 60 electric vehicles and 40 conventional cars. CO2 flooding is effective when fire load is still limited. Once 60–70 vehicles are burning or have burned, the system has contained rather than prevented.
Maritime Executive reported the fire was detected at approximately 1500h during afternoon cargo operations — no early-warning precursor data was cited, consistent with the standard onboard detection picture: smoke or a crew observation trips the alarm after ignition has progressed. By the time CO2 was ordered, the damage was set.
What a port fire has that an ocean fire doesn't
Zeebrugge changed one variable: shore-side resources. Fire department tugs stood by with nitrogen gas to prevent reflash — a capability unavailable 300 nautical miles from land. The master could also evacuate the 26-person crew to the quayside rather than into lifeboats in open water.
But port proximity did not close the detection gap. The fire was found during operations, not before it started. A shore-based nitrogen supply limits a fire that CO2 cannot fully suppress on its own; it does not wind the clock back to before the vehicle cargo ignited.
The cause investigation mirrored Felicity Ace — in reverse
Initial reporting suggested the fire had been caused by one of the 60 EVs on the deck. CLdN's subsequent investigation, published May 2025, reached the opposite conclusion: a vehicle had ignited the fire, but the company was "discounting a full electric (BEV) vehicle as the origin." No alternative cause was publicly confirmed; the investigation was still ongoing.
Felicity Ace produced the same evidentiary problem from the other direction: no one could prove the cause was a BEV, but the possibility could not be excluded. The Stuttgart court dismissed the resulting €30 million claim in May 2026 for want of proof. The Delphine produced the mirror image — BEV excluded, cause still open. In both cases the data needed to close the question was not recorded before the fire.
The detection gap is the same in port and at sea
A lithium-ion cell approaching thermal runaway vents detectable gas — hydrogen, CO, and other electrochemical signatures — before it produces the visible smoke or thermal bloom sufficient to trip a conventional detector. That pre-ignition window is where intervention can prevent a loss rather than limit one. Both Delphine and Morning Midas show the same pattern: fire found after ignition has progressed, suppression activated, cargo consumed. Shore proximity changed the logistics; it did not change the detection physics.
- CO2 effectiveness depends on the fire load at activation time, not just whether it activates.
- Port fires that are 'contained' still consume large numbers of vehicles — Delphine's 60–70-vehicle loss on a contained deck makes that concrete.
- Cause attribution after the fact is nearly impossible without continuous, location-specific pre-fire data — whether the vessel is accessible or not.
- The precursor detection window exists before every lithium-ion fire; conventional smoke and heat systems do not use it.
Sources
- Maritime Executive — "Major EV Fire Breaks Out Aboard Ro/Ro at Zeebrugge" (April 2025).
- CTIF — "Cargo Ship with 200 Cars, 60 EVs on Fire in Harbour of Zeebrugge" (April 2025).
- WorldCargo News — "CLdN rules out electric vehicle as cause of MV Delphine fire" (May 2025).
- [VERIFY: TradeWinds — 'Fire hits CLdN cargo ship with electric vehicles on board' (April 17, 2025) — paywalled; confirm exact vehicle count and CO2 account before publication.]
- [VERIFY: Confirm whether the Delphine returned to service and timeline — Splash247 reported 'Largest wind-assisted shortsea roro returns to service' but article was inaccessible; cross-check before publication.]
Questions, answered
Did the CO2 system on the Delphine successfully stop the fire?+
Yes. CLdN's master ordered the third deck closed off and the CO2 flooding system activated; Maritime Executive reported the fire was brought under control as designed. But 60–70 vehicles were already consumed before CO2 was activated. Success at the suppression stage does not mean the fire was prevented — it means it was contained after significant cargo loss had already occurred.
Was the Delphine fire caused by an electric vehicle?+
Not according to CLdN's investigation. Initial reports suggested EV involvement, but in May 2025 CLdN stated they were "discounting a full electric (BEV) vehicle as the origin." A vehicle cargo unit was identified as the starting point, but the specific cause remained undetermined when that update was published. No final cause has been publicly confirmed.
How does a port fire differ from a car-carrier fire at sea?+
Port fires benefit from shore-side resources — firefighting tugs, additional CO2 or nitrogen supply, and crew evacuation to the quayside rather than into open-water lifeboats. At Zeebrugge, nitrogen was held on standby to prevent reflash, a capability unavailable in open ocean. However, the detection gap is identical: Delphine's fire was found after it had developed, not during the pre-ignition vapour phase.
Why does gas detection matter if CO2 can contain the fire anyway?+
CO2 limits the spread of a fire that has already ignited — it cannot reverse losses already incurred. A system that catches electrochemical precursors before visible smoke gives operators a window to isolate the space, check state of charge, and pre-stage suppression before ignition occurs. Delphine's 60–70-vehicle loss on a successfully contained deck shows what 'effective CO2 suppression' looks like when detection is measured in smoke rather than precursor chemistry.
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