This individual levelled off in IMC at 2000ft in an area of high terrain with safe altitudes of 4500ft because he thought FL two zero zero meant 2000ft.
Many of my U.S. colleagues seem puzzled when I wince at their calls like 'passing flight level twenty-three point six climbing to flight level two seven zero'.
Flying Tigers had a fatal 747 accident on approach to Kuala Lumpur (Subang, not Sepang) years ago where the crew interpreted 'Tiger 66, descend two four zero zero' as 'Tiger 66, descend to four zero zero':
https://en.wikipedia.org/wiki/Flying...Line_Flight_66