（特價）芽莊OW初級潛水考證三天課程套餐（專業教練，優質潛點）HK$ 562 Dear Sirs, We 2 persons from HK will travel Nha Trang for 4 days (23-27 May 2018) and want to learn diving. We have limited experience before. Can the certificate course be shortened to 2 days? For example, 24-25 May or 25-26 May? Thanks and regards, Sam
