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Tug Mars Wreck

Massachusetts, United States
AOW suggested29–38 m (95–125 ft) depthBoat entry7mm or semi-dry + hood typical

Boat dive — see Entry & access.

Tug Mars Wreck at a glance

Tug Mars Wreck is an advanced boat dive site in Massachusetts, United States with depths of 29–38 m (95–125 ft). Typically most favorable Jul–Aug · from 3 years of archive data. Divers commonly see Frilled anemone, Cunner, and American lobster. Recent reports put the water around 14°C (57°F). Check the latest conditions and entry details before you go.

Favorable window now· until 18:00 · sunset 17:44

Forecast for this hour · 11:00 · run 10 h ago
0.3 m (1.1 ft)waves — under half a meter expected (waves — about a foot expected)

Tap a factor for its source and model point · Forecast 14°C · seasonal avg 16°C ( · Forecast 57°F · seasonal avg 60°F)

Site hazards: Depth (95-125 ft, near recreational limits); cold dark water; possible currents; entanglement from fishing gear; offshore exposure east of Manomet Point.

Read the full hazards ↓

Dive windows this week

Mon8:00–18:00 favorable

0.3 m waves · 8 kn wind (1.0 ft waves · 8 kn wind)

Tue8:00–18:00 favorable

1.1 m waves · 13 kn wind (3.6 ft waves · 13 kn wind)

Wed8:00–18:00 favorable

0.3 m waves · 2 kn wind (1.1 ft waves · 2 kn wind)

Thu8:00–18:00 favorable

0.4 m waves · 11 kn wind (1.2 ft waves · 11 kn wind)

Fri8:00–10:00 moderate, 10:00–18:00 favorable

0.3 m waves · 11 kn wind (0.9 ft waves · 11 kn wind)

Sat8:00–18:00 favorable

0.2 m waves · 9 kn wind (0.6 ft waves · 9 kn wind)

Sun8:00–18:00 favorable

0.2 m waves · 10 kn wind (0.8 ft waves · 10 kn wind)

Favorable windowModerate window— no window

Every forecast dive window each day, site-local time, from wave and wind forecasts. Numbers under each bar are daylight averages.

First light 6:38 · Sunrise 7:07 · Sunset 17:44 · some windows run past sunset

Source: Open-Meteo marine · model point 10 km from site · updated 26 Oct, 01:28 GMT-4

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Tug Mars Wreck

Forecast · NOAA tide model

Tide & slack timing

Loading tide predictions

Recent diver reports

Dated firsthand observations from divers — not current conditions.

No diver reports for this site yet. — one dated observation helps every diver after you.

Dived here today — did the forecast match?

What Divers Say

Known for: Frilled anemone, Cunner, American lobster
Best time: Summer through early fall weather windows

Based on community reviews and site data. Conditions vary — always verify before diving.

Best months, historically

What conditions have historically been typical at this site, month by month — not a forecast.

  1. January, 84% of days have historically been favorable, water has typically been 5°C (41°F), waves have typically been 0.9 m (2.9 ft), wind has typically been 14 knots
  2. February, 82% of days have historically been favorable, water has typically been 4°C (39°F), waves have typically been 0.9 m (2.8 ft), wind has typically been 14 knots
  3. March, 81% of days have historically been favorable, water has typically been 4°C (40°F), waves have typically been 0.9 m (3.0 ft), wind has typically been 14 knots
  4. April, 92% of days have historically been favorable, water has typically been 7°C (44°F), waves have typically been 0.7 m (2.2 ft), wind has typically been 13 knots
  5. May, 96% of days have historically been favorable, water has typically been 11°C (53°F), waves have typically been 0.6 m (2.0 ft), wind has typically been 12 knots
  6. June, 96% of days have historically been favorable, water has typically been 16°C (61°F), waves have typically been 0.4 m (1.3 ft), wind has typically been 11 knots
  7. July, 100% of days have historically been favorable, water has typically been 18°C (64°F), waves have typically been 0.4 m (1.1 ft), wind has typically been 11 knots, historically most favorable
  8. August, 100% of days have historically been favorable, water has typically been 19°C (66°F), waves have typically been 0.4 m (1.3 ft), wind has typically been 10 knots, historically most favorable
  9. September, 93% of days have historically been favorable, water has typically been 19°C (66°F), waves have typically been 0.5 m (1.8 ft), wind has typically been 10 knots
  10. October, 90% of days have historically been favorable, water has typically been 16°C (60°F), waves have typically been 0.7 m (2.3 ft), wind has typically been 11 knots
  11. November, 90% of days have historically been favorable, water has typically been 11°C (53°F), waves have typically been 0.7 m (2.4 ft), wind has typically been 13 knots
  12. December, 88% of days have historically been favorable, water has typically been 8°C (46°F), waves have typically been 0.8 m (2.5 ft), wind has typically been 13 knots

July and August have typically had the largest share of favorable days here. Conditions vary year to year — this is historical context, not a forecast.

Based on 3 years of archive data. Bar height shows the share of days each month whose conditions have historically scored favorably.

Marine life seen at this site

Species noted at this site — not a promise of what you’ll encounter.

Species seen here

Rough labels: “Commonly seen” usually means two or more recorded sightings near this site in public dive logs (GBIF), “Occasionally seen” one; “Seasonal” and “Rarely seen” come from dive-guide research. Not a measured rate.

Fills & rentals nearby

No dive shops mapped within 25 km (16 mi). Know one? Add it to the map.

Data updated June 2026

Site details

The Mars, a 117-ft iron steam tug built in 1890 by J.H. Dialogue & Sons, sank on 13 September 1942 after the coastal tanker Bidwell sheared off her bow in a collision east of Manomet Point, Plymouth. She rests upright and largely intact on a hard clay bottom in 95-125 feet of water, with the pilothouse lying on the bottom off her starboard side. The site is a BUAR exempted wreck open to recreational divers without a permit.

boatwreck

Depth (95-125 ft, near recreational limits); cold dark water; possible currents; entanglement from fishing gear; offshore exposure east of Manomet Point.

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