Hi, welcome to cruise chat.
Once I had a very specific question regarding a PADI dive certification, offered while at sea. I could not find the answer anywhere. So, I called RCCL, they connected me to the "shore excursion dept.". They actually had a Dive instructor call me from the Explorer of the Seas, while it was out at sea to answer my questions. Anyways, trying calling Celebrity, ask for the shore excursion dept, and ask them your questions. Good luck.