← Return to Favorite Dive Summary
Return to Explore Dive Sites← Back to dive site search
SaltwaterOceanShipwreckSource Checked

NBM Dive Site Resource

USS H-1 (SS-28) submarine wreck

Isla Santa Margarita, Baja California Sur, Mexico

Historic U.S. submarine wreck off Isla Santa Margarita, rediscovered and documented by archaeological dive teams. Public recreational access is not confirmed; the island and its waters are subject to Mexican Navy permission.

Save this dive site to your free member profile.

Historic Picture Placeholder

Old-fashioned maritime line drawing reserved for a future historic photograph
Historic Picture PlaceholderHistoric photograph pending research and rights review
WaterMarine
AccessRestricted research access. Mexican Navy permission is required for the island and surrounding waters; no public charter or routine recreational access is confirmed.
ExperienceResearch or authorized expedition divers only
Maximum depthApproximately 50–60 ft / 15–18 m in historical and expedition accounts.
Best seasonSeasonal details pending
VisibilityVisibility varies

Aquatic life at this dive site

What divers may encounter

Three reviewed connections are featured here. Sightings vary by season, conditions, and chance, so they are never guaranteed.

Profile connection reserved

Aquatic life research in progress

NBM is reviewing a likely local species for this position.

Profile connection reserved

Aquatic life research in progress

NBM is reviewing a likely local species for this position.

Profile connection reserved

Aquatic life research in progress

NBM is reviewing a likely local species for this position.

Site media

Photographs

Three views rotate from the published gallery on each visit.
Illustrated scuba diver reserved for a future dive-site photograph
Dive Photograph PlaceholderDive-site photograph pending
Illustrated scuba diver reserved for a future dive-site photograph
Dive Photograph PlaceholderDive-site photograph pending
Illustrated scuba diver reserved for a future dive-site photograph
Dive Photograph PlaceholderDive-site photograph pending

Contributor media

Dive videos

Three featured video positions are reserved on every profile.
Dive-site video pending
Dive-site video pending
Dive-site video pending

Regional location and nearby land

Location map

This is a broad historical area with nearby land shown for orientation. It is not a wreck coordinate, dive entry, or navigation waypoint.
Map areaSanta Margarita Island, Baja California Sur, Mexico
Open regional map ↗
Map zoom level 6 of 11

Map data © OpenStreetMap contributors

Recent field observations

Diver-reported temperatures

Automatically checked observations from dives during the past 14 days. Three reports are visible at a time; scroll for more.
Automatically checked
No recent diver reports from the past 14 days

A report that passes the automatic checks will appear here with the dive date, diver’s display name, and temperatures at each depth.

Reports are automatically checked for plausible dates, depths, and temperatures. They are observations, not forecasts; confirm conditions before diving.

Diver field observation

Report temperatures

Reports publish automatically when the date, depths, and temperatures pass the checks. You must be signed in to submit.

Depth readings

Before you arrive

Access notes

Obtain current written permission from Mexican authorities and work through an authorized local team. No public navigation coordinate is provided.

Plan within your training

Conditions and hazards

Historic wreck with reported ordnance and entanglement hazards; present condition must be confirmed by the authorized team.

Independent resource notice

This record is a starting point for independent verification. Access, closures, moorings, weather, currents, depth, visibility, operator availability, and site conditions can change without notice. Confirm current information with the responsible operator, property owner, managing authority, or another qualified local source before planning or attempting a dive.