The Tunnel
Conditions
Scored by DiveConnect's site-physics model
Marine forecast via Copernicus Marine. Score is a rule-based guide from swell/wind vs. the site's exposure — always dive your own assessment.
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About this site
The Tunnel is a wall dive off the coast of Guam, the largest island in the Mariana Archipelago in the western Pacific. The site takes its name from a swim-through or tunnel feature cut into the steep limestone drop-off typical of Guam's coastline, where fringing reef gives way abruptly to deep water. It is rated an advanced dive, reflecting the depth and structure of the wall itself. As with much of Guam's shoreline, access is arranged from points around the island rather than directly from a resort beach.
AI overviewMarine life here
Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.
Leptastrea purpureaReported here · unconfirmed
Princess DamselPomacentrus vaiuliReported here · unconfirmed
Dusky SurgeonfishAcanthurus nigrofuscusReported here · unconfirmed
Fivestripe WrasseThalassoma quinquevittatumReported here · unconfirmed
Pacific Bullethead ParrotfishChlorurus spilurusReported here · unconfirmed
Lined BristletoothCtenochaetus striatusReported here · unconfirmed
Indian Surge DemoiselleChrysiptera brownriggiiReported here · unconfirmed
Purple Hermit CrabCoenobita brevimanusObserved near here · iNaturalist
Blue LinckiaLinckia laevigataObserved near here · iNaturalist
Small Giant ClamTridacna maximaObserved near here · iNaturalist
Durable tips from divers — access, hazards, marine life, facilities. For day-of conditions, use the report tool in the conditions card above.
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