A dive briefing · Belize Barrier Reef & atolls, Belize

Ermlund Wreck

Dive site on the Belize Barrier Reef or its offshore atolls. Here's what has been recorded at this site month by month, how the region’s reefs have weathered ocean heat, and how to prepare.

Belizewreck

At this sitegeotagged 709 m from the site coordinates Atlantic long-spined sea urchin (Diadema antillarum) · Loopy30 · CC BY-SA 4.0 · iNaturalist

Symmetrical brain coral (Pseudodiploria strigosa)

Chapter I · Arrival

Ermlund Wreck: dive site on the Belize Barrier Reef or its offshore atolls.

~17.214° N~87.528° W · OpenStreetMap · node/8433034767

14,266open records · GBIF

78+species recorded

At this sitegeotagged 709 m from the site coordinates Symmetrical brain coral (Pseudodiploria strigosa) · Loopy30 · CC BY-SA 4.0 · iNaturalist

Entry

Shore and boat entries vary by site. We list only rules we can cite from official sources; entry points, depths and currents will be added once we can verify them.

Approximate positionThese coordinates come from a crowd-sourced map or Wikidata item, not an official mooring list. Use them for orientation only.

To verifyDepth range, entry points and current notes. We publish them only with a citation. The coordinates mark the site in general, not a mooring or entry point.

Local rules (cited)

Hol Chan Marine Reserve: you may dive and snorkel in the recreational zones only after registering and being briefed on the reserve rules; scuba only if you are certified or on a course run by a certified instructor. Belize Fisheries Department · Hol Chan Marine Reserve
Hol Chan: fishing and feeding fish are prohibited, gloves are prohibited, and no gear other than fins and mask is allowed. Belize Fisheries Department · Hol Chan Marine Reserve
Scuba diving is prohibited within the exclusive recreational area of Shark Ray Alley. Belize Fisheries Department · Hol Chan Marine Reserve

At this sitegeotagged 709 m from the site coordinates Symmetrical brain coral (Pseudodiploria strigosa) · Loopy30 · CC BY-SA 4.0 · iNaturalist

**Open media** · At this sitegeotagged 709 m from the site coordinates Atlantic long-spined sea urchin (Diadema antillarum) · Loopy30 · CC BY-SA 4.0 · iNaturalist

The surface noise falls away.

Reds go first. The world turns blue-green.

Then Ermlund Wreck rises to meet you.

Atlantic long-spined sea urchin (Diadema antillarum)

What lives here, by month

Pick a month. These are the species most often recorded within about a kilometre in that month, from open survey records.

Oct

October · 3,372 qualifying records

Life calendar · records per month for this site's most-recorded species (blank means not in that month's top list)

Species	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Symmetrical brain coral
Caribbean hermit crab
Thin leaf lettuce coral
Elkhorn coral
Mustard Hill Coral
Great Star Coral
Boulder star coral
Nurse shark
French Grunt
Graysby
French angelfish
Threespot Damselfish

Most-recorded species, all months

GBIF.org (2026-10-15), occurrence records within ~1 km, licensed CC0 or CC BY 4.0 only. Birds and land animals are excluded. Counts reflect survey effort, not abundance. 14,266 qualifying records. See them on GBIF. Common names: Wikidata (CC0) / GBIF. Species photos: Wikimedia Commons, credited with each species.

Forty-one summers of heat

Each stripe is one year since 1985, colored by its peak heat stress across NOAA's “Belize” region. These are NOAA Coral Reef Watch satellite figures for the whole region, not for this one site.

19852026

Reef health report · Belize

Heat stress, measured from orbit.

Degree Heating Weeks · 2026-10-1314.8°C-weeks · NOAA status: Alert Level 2

NOAA CRW virtual station “Belize”. NOAA's alert thresholds are 4 °C-weeks (Alert Level 1) and 8 °C-weeks (Alert Level 2). Station page · Method. Credit: NOAA Coral Reef Watch.

Peak per year · dashed lines at 4, 8 and 16 °C-weeks

The past twelve months

Conditions

Average sea temperature through the year. Check the live readings before you go.

Average sea surface temperature by month: NOAA CRW “Belize” station climatology (monthly means).

National Meteorological Service of Belize · forecasts →

Buoy readings are measurements; forecasts are models. Use them for planning only, and assess conditions on site. Depth and visibility data aren't listed until we can cite a source.

VII

Plan & prepare

Read the official marine forecast the night before.Offshore, wind and sea state decide the day.
Check the cited local rules above and pay any park fee before you dive.[Placeholder: verified operator list to come]
Study this month's species above.You'll recognise more when you know the names.
Hands off, fins up, buoyancy dialled. Log what you see.Your sightings can become tomorrow's open data.

◎

Photographs from Ermlund Wreck

Openly licensed photos, each checked for location against its title, description, category or geotag. Labels show how close each one is to the site.

**Yellow goatfish (Mulloidichthys martinicus)**At this sitegeotagged 709 m from the site coordinates Loopy30 · CC BY-SA 4.0 · iNaturalist

**Stoplight parrotfish (Sparisoma viride)**At this sitegeotagged 709 m from the site coordinates Loopy30 · CC BY-SA 4.0 · iNaturalist

**Slippery dick (Halichoeres bivittatus)**At this sitegeotagged 709 m from the site coordinates Loopy30 · CC BY-SA 4.0 · iNaturalist

**Donkey dung sea cucumber (Holothuria mexicana)**At this sitegeotagged 709 m from the site coordinates Loopy30 · CC BY-SA 4.0 · iNaturalist

**Atlantic white-spotted octopus (Pinnoctopus macropus)**At this sitegeotagged 709 m from the site coordinates Loopy30 · CC BY-SA 4.0 · iNaturalist

**Beaded sea cucumber (Euapta lappa)**At this sitegeotagged 709 m from the site coordinates Loopy30 · CC BY-SA 4.0 · iNaturalist

**Mustard hill coral (Porites astreoides)**At this sitegeotagged 709 m from the site coordinates Loopy30 · CC BY-SA 4.0 · iNaturalist

Credits

Coordinates: OpenStreetMap node/8433034767 · source · ODbL. Wikidata (CC0) and OpenStreetMap (ODbL) features. These are approximate positions, not official mooring coordinates. Approximate position.
Species records: GBIF.org, CC0 & CC BY 4.0 records. By license: CC_BY_4_0: 14,252, CC0_1_0: 14
Dataset: EOD – eBird Observation Dataset · doi:10.15468/aomfnb (14,034 records) · GBIF
Dataset: iNaturalist Research-grade Observations · doi:10.15468/ab3s5x (128 records) · GBIF
Dataset: Atlantic and Gulf Rapid Reef Assessment - Benthic · doi:10.15468/vmcydh (97 records) · GBIF
Dataset: LACM Malacology · doi:10.15468/xxm2eb (7 records) · GBIF
Query: https://api.gbif.org/v1/occurrence/search?decimalLatitude=17.203629999999997,17.22363&decimalLongitude=-87.53790000000001,-87.5179&license=CC0_1_0&license=CC_BY_4_0&taxonKey=44&taxonKey=206&taxonKey=229&taxonKey=136&taxonKey=225&occurrenceStatus=PRESENT&limit=0
Heat stress & SST: NOAA Coral Reef Watch, 5 km Regional Virtual Station “Belize”
Hero photo: At this sitegeotagged 709 m from the site coordinates Atlantic long-spined sea urchin (Diadema antillarum) · Loopy30 · CC BY-SA 4.0 · iNaturalist
Arrival photo: At this sitegeotagged 709 m from the site coordinates Symmetrical brain coral (Pseudodiploria strigosa) · Loopy30 · CC BY-SA 4.0 · iNaturalist
Gallery: 7 photos, credited under each image
Species photos: Wikimedia Commons, credited with each species. Full list: Data & sources