De or het wederinstorting?

The correct Dutch article is:

de wederinstorting

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

How to use wederinstorting

the wederinstortingde wederinstorting
this wederinstortingdeze wederinstorting
that wederinstortingdie wederinstorting
our wederinstortingonze wederinstorting
your wederinstortingjouw wederinstorting
every wederinstortingelke wederinstorting
which wederinstorting?welke wederinstorting?
a big wederinstorting / the big wederinstortingeen grote wederinstorting, de grote wederinstorting