become of (someone or something)
to happen to someone or something
I do not know what became of my pencil.
I do not know what became of my friend from high school.
Biggest Man Made Environmental Disasters
A huge crude carrier bearing the flag of Liberia split into three parts and sank, releasing 1,604,500 barrels (219,797 tons) of light crude oil and 4,000 tons of fuel oil making it the largest oil spill of its kind at that time and resulted