In Jeju, it is illegal to kayak near the naval base. There is a fancy wording for that but practically that is what it comes down to.
It is NOT illegal to kayak in the harbor though.
The SOS team and a single diver(wanting to assess the effects the blasting done by the naval base on the rock formation and sea life) took a watery stand against the construction of the naval base yesterday and while they did not make it very far the yellow flags rose out of the water like peaceful water lilies.
What you see in the photos is the resistance they meet from the coast guard, the diver being held in the water by the water authorities after some pushing and kayaks being prevented from sailing.