None dive without proof of certification.
Unless a person can produce documentation of being a Certified Diver you will not be allowed to dive.
Read it and weep!
Call it Tough Love.
PADI has a site http://www.padi.com/scuba/
dive check that can search for your certification, but the site doesn't go back to the 70's so divers
bring your cards.Its much easier to locate records from home before you travel.
Your options are to take a SCUBA Certification course.
Wanta make us smile, tell us your an old Navy SEAL or a friend of Jacques Cousteau but don't have a card, like we've never heard that before :-)