xkcd

the crust ... starts crumbling somewhere else creating new mountains or islands

Exactly. The oceanic crust will (in geologic time) crack in front of the bolts and be dragged down parallel to the bit that was bolted, stacking the oceanic crust with the newer bit under the older one.

The cracking and stacking happens naturally and this creates stacks of many oceanic crust sections moving to the left of the picture.