De or het neerstorting?

The correct Dutch article is:

de neerstorting

Rule Words ending in -ing: almost always de. See the rule

How to use neerstorting

the neerstortingde neerstorting
this neerstortingdeze neerstorting
that neerstortingdie neerstorting
our neerstortingonze neerstorting
your neerstortingjouw neerstorting
every neerstortingelke neerstorting
which neerstorting?welke neerstorting?
a big neerstorting / the big neerstortingeen grote neerstorting, de grote neerstorting