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Some difficulty booking online so we went to the office the day before to make our booking. In reality they didn't take our credit card details so they should have been able to accept the booking without a Korean credit card. You need your passport to collect tickets and you need to fill in a boarding card. You take a boat to the island before boarding the submarine. Sit near the back to board earlier. The submarine has two rows of windows and each window is shared by two. As you descend you will see fish along the rock wall and a diver will swim around the submarine feeding the fish food. At the bottom there is a ship wreck. Although not cheap, we felt it was a special experience well with the money and it was memorable for our 3 year old.