How to take a boat in the ancient and modern martial arts competition?

Go to the East China Sea Beach, buy explosives first (you can find them from the thief in the capital, or buy them from Guo Jing. Guo Jing is on Peach Blossom Island, you can recruit them by text message, and text messages are free). Enter the seabed cave and ask him. Go right, blow up the rocks and continue walking inside to get the boat. The boat must be at the dock to launch into the sea