SSI Divers may print out their certifications from the SSI home page. Go to
http://www.divessi.com/home nd click on MySSI. Now click on ONLine Check, click the agreement box and then enter your first name, last name and DOB (Make sure it's in the right format) You should get a list of all the SSI specialties you have. Print it out that should suffice as proof. You can even print temp cards if you've lost your c-card. PADI requires DiveMaster candidates have proof of Advanced certification and Rescue Diver Cert, which SSI treats as a specialty. Good Luck with your course.