Visitor harm clusters on jellyfish in the stinger window, boat traffic at pontoons, current on outer walls, and sun. Wreck depth is a separate chapter. This is not medical advice.
A cancelled day is a safety decision.
Hazards
- Box jellyfish and Irukandji — Seasonal, coastal and some reef edges; operators issue suits.
- Boat props at pontoons — Crowded ladders.
- Current on ribbon walls and wrecks — The Yongala is not a lagoon.
- Cyclone and wind swell — Outer reefs close.
- Sun and dehydration — A tropical day boat is a roof problem.
- Coral cuts — Limestone and infection; clinic, not seawater folklore.
Rules
- Wear the issued lycra — When the operator hands it over.
- Stay inside ropes and green-zone manners — The park brief.
- No untrained wreck penetration — Yongala is typically an exterior.
- Listen for the stinger and wind call — Boats cancel.
- Buddy or a watcher on a cay snorkel — Same as the snorkeling chapter.
Red flags
- Skipping the suit because the water looks empty — Invisible risk.
- A guide kneeling on coral for a photo — Refuse.
- Adding depth on a first outer day — Turn.
- Chest pain or a sting with systemic signs — Emergency path, not a forum.
First response
- Follow the boat vinegar / first-aid station and call for help — Species and protocols are local; this page will not pick a myth.
- Coral cuts — Clean water, then clinical care if dirty.
- Not medical advice — Envenomation and DCI are clinical.
Reef safety here is a suit, a rope and a weather call. The wreck can wait for a planned day.