I was taking my Open Water certification overseas and was unable to complete the last 2 open water dives. My instructor gave me a Scuba Diver Certification and said that for my next 2 dives I have to go with a certiifed instructor to get my open water certification. Can anyone tell me how expensive this is to do as I have already paid the money to the original instructor? I am leaving overseas to come back to the states and can't finish with him.