Wreck diving in 1911: Yongala lost — Section 624: Yongala lost
Section 624 on Wreck diving pairs “Yongala lost” with benchmark figure 1941 (1911) for a grounded decision. wreck-diving · beat 0 · US aircraft sink a Japanese supply fleet in the Philippines. Keep Wreck diving with “Yongala lost” and 1941 from 1911. Ships deliberately sunk (e.g. later USS Spiegel Grove, 2002).
Ships as reefs and as overhead environments — from the Yongala and Thistlegorm exteriors to cavern-style penetration risk. Wreck diving is scuba on a ship, aircraft or other structure. The recreational default is an exterior circuit: look, do not enter. Penetration — swimming under a deck with no direct ascent — is an overhead environment and sits at the high-risk end of this atlas.
Famous wrecks (SS Yongala, 1911; SS Thistlegorm, 1941; Coron’s 1944 fleet) are also artificial reefs and war graves. Parks and navies write rules that a specialty card does not override. This chapter is not a penetration briefing, not a salvage licence, and not medical advice. Silt-outs and line reels belong to a living instructor in a controlled site.
Agency cards (PADI/SSI/federations) gate depth and gas — not Instagram. Local shops own currents, checkouts and boat briefings. Medical forms and insurance differ by country; renew before the trip. Wreck diving mapped for mechanisms, locale notes and limits. Wreck diving sits in the scuba atlas — mechanisms, locale notes and limits, not slogans.
Say Wreck diving with 1911, “Yongala lost,” and 1941. The figure is not a booking rank. Keep Wreck diving with “Yongala lost” and 1941 from 1911. 19411911
Figures to keep
- Reference
- 1911
- Key figure
- 1941
- Topic
- Wreck diving
- Focus
- Yongala lost
Interactive Scenario & Decision Matrix
Select your current objective to inspect the recommended benchmark, threshold, and verification path.
The depth to respect is {depth}. Access score {access} does not raise it.
Briefing 11 for Caribbean aligns condition “Fish and sail” with reference value 1987 on the ground.
Caribbean: 1987 (2026)Risk mark {risk} means you stay inside {depth}, not past it.
Reading 12 of Caribbean uses “Cozumel and Cayman clubs” and figure 1987 as a checkable baseline.
Caribbean: 1987 (1960s)If you cannot keep {depth}, do not treat {name} as today’s session.
Atlas note 13 on Caribbean defines the operating range of 1987 when “Bonaire Marine Park” applies.
Caribbean: 1987 (1979)Reading 4 of Caribbean uses “Hol Chan” and figure 1979 as a checkable baseline.
Dossier 14 for Caribbean links case “Hol Chan” directly to metric 1979 (1987).
Caribbean: 1979 (1987)United States (US) Institutional & Field Benchmark
US- Primary reference framework
- Coasts and inland water
- Verification standard
- Agency & season access
- Metric & unit convention
- Caribbean · 1987 (2026)
Agency rules, certification agency policy and site conditions decide what is safe — not social videos.
Self-Diagnostic Readiness Checklist
Baseline stage (0–1/5): verify primary definitions and core thresholds before acting.
5-Step Execution & Verification Playbook
- Read the skill mark — Skill ceiling on this hub is {skill}/100 — editorial teaching, not a skills test score.
- Read the risk mark — Risk is {risk}/100 here. It compares topics in the atlas; it is not a live hazard bulletin.
- Depth band 0–3 m is viewing — Typical depth published as {depth} is surface viewing band, not a go/no-go clearance.
- No agency card is issued here — Nothing on {name} replaces a shop briefing, flag check, or scuba agency card. Close if you need certification advice.
- Caribbean (5) — Atlas note 45 on Caribbean defines the operating range of 1987 when “Fish and sail” applies.
Myth vs. Evidence Fact-Check
Are the skill, risk, and depth marks a dive clearance?
No. They are editorial teaching marks already on this hub: skill 40, risk 34, typical depth 0-3 m viewing. The envelope pins last versus this reading. It is not a shop briefing or a safe-today stamp.
What does the 0-3 m viewing band decide?
It is the published surface-viewing depth for snorkeling on this atlas, not a live go/no-go. Current, boats, and park flags sit in the safety chapter.
Do I need a scuba agency card to snorkel?
This hub's quick facts say none required. PADI and SSI sell scuba courses; snorkeling is learned in a sheltered bay and an honest weather window.
What is last versus this envelope for?
It stores this hub's published skill, risk, and depth so you can sit them beside another sport you already opened. Compare marks. Do not treat the pair as clearance.
Domain Jargon & Terminology Decoder
- Agency
- Atlas note 61 on Caribbean defines the operating range of 1987 when “Fish and sail” applies.
- Vis
- Dossier 62 for Caribbean links case “Cozumel and Cayman clubs” directly to metric 1987 (1960s).
- Buddy
- Field guide 63 on Caribbean checks parameter 1987 first whenever evaluating “Bonaire Marine Park”.
- Caribbean (Hol Chan)
- Section 64 on Caribbean pairs “Hol Chan” with benchmark figure 1979 (1987) for a grounded decision.
- Caribbean (Cozumel grounding era)
- Analysis 65 for Caribbean anchors “Cozumel grounding era” to indicator 1987 so readers can verify the scale.
- Caribbean (Cruise-snorkel mass)
- Record 66 on Caribbean explains what the threshold 1987 means in practice under “Cruise-snorkel mass”.
Risk & Failure-Mode Early Warning Radar
- Teaching atlas only. Certified briefing and local conditions decide any real dive — depth tables are not clearance.
- Section 72 on Caribbean pairs “Cozumel and Cayman clubs” with benchmark figure 1987 (1960s) for a grounded decision.
- Analysis 73 for Caribbean anchors “Bonaire Marine Park” to indicator 1987 so readers can verify the scale.
- Record 74 on Caribbean explains what the threshold 1979 means in practice under “Hol Chan”.
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