Apparently the inert gas systems are not always properly maintained: https://www.offshore-energy.biz/pablo-tanker-explosion-exposes-dangers-of-growing-shadow-f

Apparently the inert gas systems are not always properly maintained: https://www.offshore-energy.biz/pablo-tanker-explosion-exposes-dangers-of-growing-shadow-fleet/ https://www.offshore-energy.biz/pablo-tanker-explosion-expos... (Googling "oil tanker explosion" produces quite a few similar events)