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Quick answers
Which local rescue or training agency should I check first?
Use the local lens: coastguard/federation norms and the shop briefing for that bay — not a blog visibility claim.
Udo?
A small island east of Jeju (the name means cow) with beaches and shallows used for snorkelling, including Hagosudong-type sand. A ferry, not a liveaboard.
Who are the haenyeo?
Jeju women who harvest on breath-hold, a living work culture listed by UNESCO in 2016. Tourists should not copy the work or treat a dive-ground as a playground. See freediving and Jeju's culture chapter.
Is Jeju tropical?
No. It is a warm-temperate to subtropical island. Visibility and soft-coral colour are seasonal, not a Maldives lagoon.
Seopseom?
Another Seogwipo islet on the same boat map as Munseom and Beomseom, often mentioned in the same brief.
Jungmun?
A resort coast with a beach and, nearby, the Daepo jusangjeolli (columnar joint) shore: geology as much as a snorkel. Swell closes it.
Harm clusters on swell at the islets, cold-water shock outside high summer, Seogwipo boat traffic, and treating a haenyeo ground as empty. This is not medical advice.
A cancelled boat is a safety decision.
Hazards
- Swell and current at Munseom / Beomseom — Open-sea islets.
- Cold outside the short summer — A temperate island.
- Harbour and ferry traffic — Seogwipo, Udo.
- Lava and columnar cuts — Jungmun, Seongsan shores.
- Wind chop on east-coast beaches — Hamdeok is not always a pool.
- Working-diver gear in the water — Floats, weights, a job.
Rules
- Harbour and ferry calls — The day's law.
- Berth for working pairs — Haenyeo water is labour.
- Buddy on islet dives — Traffic.
- Exposure that matches the month — Pride is not insulation.
- Exit before the last ferry — Udo has a clock.
Red flags
- A shop selling Munseom in a winter warning — Walk.
- A camera boat crowding a working pair — Leave.
- Blue lips and a 'one more bay' — End the day.
- Blood on columnar rock and a rising swell — Exit, clinic.
First response
- Harbour emergency services and Jeju clinics — Not a DCI protocol page.
- Cuts and cold — Clinic over folklore.
- Not medical advice — Hypothermia and drowning are emergency-service problems.
Jeju safety is a harbour flag and a thicker suit. The working coast can stay at work.