The diesel generator engine failure that sparked an engine room fire and total power blackout on board the UK-flagged site investigation vessel Kommandor Susan in January 2025 was caused by substitute engine components installed during a 2019 overhaul, the investigation report issued by the UK government organization Marine Accident Investigation Branch (MAIB) states.

Owned by Gardline Shipping Limited, Kommandor Susan suffered the failure of a diesel generator engine at 1:05 p.m. on January 25, 2025, while performing sea trials in the Firth of Forth, Scotland.