A broken open queen cell during inspection. Did you see any more queen cells that were intact? is the queen still in the hive and laying --- Did you see eggs, young larva, and capped brood? where they swarm cells, Supersedure, or emergency cells. due to the fact that they were on the bottom of the frames and got torn during an inspection I would guess they are swarm cells... Unless the inspection hinted at something else.
It is decision time Split, or let swarm. Hopefully they still have a viable queen cell or the young larva to draw a new one.
It is hard to give relevant advice until you can explain what you seen in the hive.
Yes or no... Eggs, Larva of all ages. capped brood, The 1-2-4 in egg to brood; the amount of cells with eggs should equal twice as much cells with larva, and then again twice as many cells of capped brood. Find the queen, queen cells - capped cups being fed with larva inside?
You want to determine if the queen is still there and is still laying if so swarming can be prevented. If she has slowed or stopped laying there is a good chance they will swarm. to stop create a artificial swarm by starting a nuc with the queen and let the hive requeen itself.