South Koreo is not known as a diving destination.  We've scoured the internet looking for any information and this is all we've come up with!

Cheju (Jeju) Island is an hour from Seoul by plane, and Sogwipo (where most of the diving takes place) is another hour by bus (there is a shuttle from the airport to Sogwipo).   The water is subtropical, ranging from 65-75 degrees from winter to summer. The fish life is pretty interesting, and the offshore volcanic islets have 200ft walls covered with soft coral. Visibility is usually around 40-50ft.

Places such as Kangnung, Sokcho, Donghae, etc. all have a number of dive shops that rent equipment and take you out on boat dives (mostly inflatables).  There's not that much to see, just some fish and invertebrates.

South Korea is in East Asia, occupying the southern half of the Korean Peninsula. The capital and largest city is Seoul, the world's 2nd largest metropolitan city.  Here's the map.

To the north, it is bordered by North Korea, with which it was united until 1945. To the west, across the Yellow Sea, lies China and to the southeast, across the Korea Strait, lies Japan.

• Operators are unlikely to speak good English.
• The west coast is too silty so isn't worth diving.
• The southern coast is subject to late summer typhoons that bring strong winds and heavy rains.