PADI Reactivate

My last bit of preparation complete. At 66 it's a very good feeling when someone offers you reactivation. I was hoping it might mean I was reactivated back to about 26, but it was just checking I was still compotent as a scuba diver. All went well with the 20 e-learning modules. I scored 100% in my final exam. On Saturday I had to do my practical in a swimming pool in Basingstoke. I originally got my PADI Openwater Diver qualification in Sham El-Sheikh. This was a million miles from a Basingstoke swimming pool, but I jumped in enthusiastically. All going well, when my instructor gave me the next set of instructions on the surface. I was required to descend and duly let the air out of my BCD and elegantly slipped below the surface. Had I had the regulator in my mouth, instead of my snorkel, everything would have been fine. However, after my first deep breath below snorkel depth, I was left coughing and spluttering before I managed to retrieve my regulator, breath out water and breath in air. I was still below water and thought, good; I've survived and no one noticed my life threatening mistake. Well he had, my instructor. At he end I casually asked if he had noticed and he said yes, but he still passed me. Great Barrier Reef here I come.