Following are some questions that need to be defined: 1.Appoint the place and time for in water survey and the seller is supposed to carry the vessel to there in time. 2.The qualification of diver and who to afford the fee for entrust a diver 3.The appointment is conducted by the buyer or both the buyer and seller 4.Is surveyor from Classification Society needed to be on spot? 5.What if damage or defect is found at the bottom of vessel 6.Does the conclusion made by diver has the same legal validity as judgment from surveyor?Following are some questions that need to be defined: 1. Appoint the place and time for in water survey and the seller is supposed to carry the vessel to there in time. 2. The qualification of diver and who to afford the fee for entrust a diver 3. The appointment is conducted by the buyer or both the buyer and seller 4. Is surveyor from Classification Society needed to be on spot? 5. What if damage or defect is found at the bottom of vessel ? 6. Does the conclusion made by diver has the same legal validity as judgment from surveyor?