bonniewaycott.com · Community
Dive log with a 30.8 m L-Arch entry and species notes including giant trevally, snappers, lionfish, and shrimps.
Dive Spot Guide•
L Arch
L Arch is a boat-access L-shaped arch off Irabu Island.
Scuba DivingBoatIntermediate
CavePinnacleWall
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Local operator required
Local guide support is the standard way to dive the site.
Boat dive off Irabu Island with a long arch, tunnel-like sections, and current that rewards precise buoyancy; best for confident intermediate and advanced divers.
About L Arch
L Arch is a boat-access L-shaped topography dive off Irabu Island with a long overhead arch, tunnel-like sections, and cave holes that make it a skill-first site. Current can be strong, so the dive rewards controlled buoyancy, calm pacing, and a comfortable attitude around overhead terrain. Expect schooling fish and smaller life around the walls and holes, with the structure itself doing most of the work.
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Research Estimate At L Arch
Conservative baseline from public research. No community dives logged yet.
VisibilityVisibility: 25m
AccessModerate entry effort
CoralSome damage
Aquatic LifeExceptional variety
FacilitiesBasic facilities
Crowd / PopularityFew visitors
CurrentStrong current
SurgeLight surge
Where Is L Arch?
This spotNearby spots
Community sourced coordinates.
L Arch Planning Details
Depth range, seasonality, and planning context.
Reported Depth
15m - 35m
Depth Note
Local guides describe the arch and tunnel route as spanning roughly 15-35 m, with a deeper cave-like section under the arch.
Best Season
Summer, especially May to September, when Irabu is more favorable.
Typical Conditions
An advanced boat dive with long overhead sections, strong current on some dives, and clear water when the sea settles.
Safety & Access At L Arch
Hazards, restrictions, and access requirements.
Key Hazards
Dangerous wildlifeOverhead environmentStrong current
Safety Notes
Watch current at the arch and cave entrance, keep buoyancy steady under overhead sections, and plan the dive with local guide support.
Access Restrictions
Boat access and local guide support are strongly recommended because of the overhead sections and current.
Legal Notes
Follow local guide and boat-briefing rules for overhead-environment diving.
Local Intel For L Arch
Community notes to help plan your visit.
Scuba Diving
Boat-access topography dive with a long L-shaped arch, tunnel-like sections, and a cave; best for confident intermediate and advanced divers.
Freediving
Not a casual freedive site because the arch and tunnel are deep and overhead.
Snorkeling
Not a snorkeling site; the main features are deep and overhead.
L Arch Dive Conditions Planner
Use the planner to scan this week, inspect today in local time, and understand how exposure shapes conditions at L Arch.
Current Snapshot
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🌥️Variable
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Surface / Entry
Wind No data · Tide No data
Sea State
Swell No data · Period unavailable
Visibility Outlook
Rain chance No data
Wind
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Swell
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Exposure Profile at L Arch
Directional shelter context for incoming swell.
Exposure Note
Hourly forecast data is not available yet.
Wildlife at L Arch
Species commonly reported at this site, with direct links into their wildlife guides.
Recent Logged Visits At L Arch
Community dive logs and visit reports for this site.
No Dive Logs Yet
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Dive Spot Log Averages At L Arch
Average conditions based on logged dives & visits.
Conditions
Avg. Visibility25m
Activity
No dive activity logged yet.
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L Arch Guide - Frequently Asked Questions
Planning answers for access, conditions, timing, and site logistics.
L Arch Guide - Sources and Updates
Last Updated
Research Sources
miyako-aquaticadventure.com · Dive Center
Dive-center page with a 20 m arch start, 35 m depth under the arch, and fish/crab observations.
myakuzumi.com · Tourism
Tourism feature placing L-Arch among advanced sites and favoring Irabu in summer.
umdb.um.u-tokyo.ac.jp · Academic
Academic site note placing L-arch north of Irabu with a dark arch/cave profile and guide recommendation.
www.owd.jp · Dive Center
Operator guide with boat entry, 15-35 m depth, 20-40 m visibility, strong current, and summer seasonality.
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