RUGGED SCUBA--OPEN WATER SCUBA - 5 Day Certification Training Interested in diving anywhere in the world? Then successful completion of Rugged Scuba (OWS) will give scouts a lifetime certification issued by PADI, the largest and best-known training agency in the world today. OWS involves five full days of training beginning when you arrive at camp and ending on Friday. Home study of 12-16 hours must be completed before coming to camp.