Here's Merriam Webster's definitions of glory hole...
Definition of GLORY HOLE
1 : a furnace for softening glass when it becomes stiff in offhand working and for fire-polishing glassb : an opening directly into the interior of such a furnace;specif : bottoming hole
2 : a receptable (as a box or cupboard) or area into which odds and ends are put haphazardly and in no particular order
3 a : lazaretto 3
b : the quarters of stewards or stokers on board a ship
4 : an opencut or funnel-shaped excavation formed by drawing off soft or broken ore through an underground passage —called also mill hole