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American Tanker, wreck

The American Tanker, located off the coast of Guam in the United States, is a remarkable dive site that offers a glimpse into World War II history. This large concrete barge was once used to transport fuel and served as a fuel storage and transfer "dock" for visiting ships. Today, it serves as an incredible wreck dive for divers of all levels.

As you explore the American Tanker, you'll be accompanied by vibrant butterfly and damsel fish, creating a mesmerizing underwater experience. Macro photographers will have the opportunity to capture stunning shots of skeleton shrimp residing on the clear tunicates scattered around the wreck.

This dive site caters to both beginners and experienced wreck divers. Beginners will find it an easy dive, while experienced divers can delve deeper into the submerged wreckage. Noteworthy features to explore include the pilot house near the stern and the presence of majestic elephant ear sponges strewn across the main deck. Don't miss the iconic American flag hanging off the western side of the pilothouse.

Important note: It is crucial to have proper wreck diver training before entering any overhead spaces or attempting to breathe any trapped air. Always ensure you stay within your limits while diving.

Location: Glass Breakwater, Port of Guam, Piti Municipality, Guam, United States
Visibility: Up to 12 meters
Max Depth: 22 meters
Recommended Diver Level: Advanced, Expert

Diving Conditions Score for American Tanker, wreck

8
Very Good

Very good diving conditions!
The score is based on a calculation of the current weather and sea conditions.

Dive Site Overview for American Tanker, wreck

Depth

22m

Visibility

12m

Experience Level

advanced
expert

Weather Conditions for American Tanker, wreck

Wave Height

0.96m

Wind Speed

2 m/s

Water Temp

29.8°C

Visibility

6.98km

Cloud Cover

30%

Wave Period

7.3s

Air Temperature

25.7°C

Precipitation

0.1 mm

Detailed 7-Day Diving Forecast for American Tanker, wreck
Alpha

Dive Score Chart for American Tanker, wreck

Best time to dive: 17:00 with score 8.203187671232875/10. Water conditions: Waves 0.96m, Wind 3.3 m/s.Best night dive time: 20:00 with score 7.991641379310345/10.

Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.

Sunrise at American Tanker, wreck: 06:00
Sunset at American Tanker, wreck: 18:00

Optimal diving conditions at American Tanker, wreck are affected by daylight hours. Sunrise occurs at 06:00 and sunset at 18:00, which impacts visibility and water temperature for scuba diving and snorkeling.

🌞
Best Overall
17:00

Score: 8.2/10
Waves: 0.96m (7.3s), Wind: 3.3 m/s

🌙
Best Night
20:00

Score: 8.0/10
Waves: 0.96m, Wind: 1 m/s

Seasonal Analysis for American Tanker, wreck
Alpha

Historical patterns and best seasons for diving at American Tanker, wreck

The dive score combines all factors to rate overall diving conditions throughout the year. Higher scores indicate better diving conditions.

Monthly Dive Score Analysis - Seasonal Diving Conditions

Higher values indicate better diving conditions

Seasonal DiveScore Chart

This chart displays monthly diveScore data throughout the year, showing seasonal patterns. The data is presented as a bar chart with an overlaid line graph.Dive scores range from 1 to 10, with 10 being optimal conditions.

Higher values indicate better diving conditions

Best Season for American Tanker, wreck

Winter

Avg. Score: 10.0/10

Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.

Best Months for American Tanker, wreck

January
Score: 10.0
February
Score: 10.0
March
Score: 10.0

Ideal Conditions for American Tanker, wreck

Water Temp

Thermometer Emoji

21.3°C / 70.3°F

June

Visibility

Telescope Emoji

20.1m / 65.9ft

May

Wave Height

Wave Emoji

0.2m / 0.7ft

January

Wave Period

Wave Emoji

8.0s

January

Seasonal Insights for American Tanker, wreck

American Tanker, wreck shows typical northern hemisphere patterns with June being the warmest month (21.3°C) and December the coldest (17.3°C). The calmest conditions typically occur in January with average wave heights of 0.2m and wave periods of 8.0s. The most comfortable wave conditions are in January with a low wave steepness ratio, creating gentler swells. January offers the longest wave periods (8.0s), creating more comfortable and predictable conditions for boat entries and exits. Ocean currents are slowest in January (0.5m/s) and strongest in January (0.5m/s). January is usually the driest month with 0.0mm of precipitation. For beginners, the best time to visit would be during January to March, when ocean conditions are calmer with long-period waves and currents are typically weaker. Experienced divers might enjoy the challenges and potentially better visibility during the shoulder seasons, with moderate currents that can improve marine life encounters.

Scoring Legend:
9-10 (Excellent)
7-8 (Good)
5-6 (Average)
3-4 (Poor)
1-2 (Dangerous)

Last updated: 31 min. ago - Jun 22, 2026

Note: This dive site is not a verified dive site. Please dive with caution. This dive site might have incorrect information by the community.

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