Blanche Prison

North Carolina, United States

Depth

15m

Visibility

4m - 12m

Entry

Shore

Experience Level

Experienced

Blanche Prison

North Carolina, United States

Depth

15m

Visibility

4m - 12m

Entry

Shore

Experience Level

Experienced

About Blanche Prison

This site is ideal if you enjoy quarry diving. The visibility at this medium sized spring-fed quarry ranges from 15 feet in the summer to around 40 to 50 feet in the winter. In the summer there are thermoclines at about 20 to 40 feet. The temperature varies at different depths - 80 degrees on the surface, 70 degrees at 20 to 40 feet, and 44 degrees at maximum depth (which is around 90 feet). One can observe an old 707 cockpit, a school bus, a cabin cruiser, a few boats, and more at this quarry. This place is great to dive if you are a few hours away from the coast. Several divers dive the quarry each weekend. During the summer the visibility can be lowered as there are many OW classes held at the quarry. If diving during the week the quarry is usually empty. There is an outhouse, a picnic area, a changing area, close parking and two docks at this site. In order to be allowed to dive at the quarry you have to be a member of the local dive club and the Piedmont Dive Rescue Association (www.ncpdra.org & www.danvilleaquanauts.com) . The Association offers three inshore dive sites to its members. The joining cost is about $55 (as well as dues to an associated club which can range from $5 upwards). With the membership you get 365 days a year access to 3 great rock quarries.

Blanche Prison Dive Info

Terrain & Features

Rock, Inland

Entry Type

Shore

Max Depth

15m

Visibility Range

4m – 12m

Experience Level

Experienced

Best Gas Mix

21%

O₂

CNS Load (45 min)

11% at 13m / 36%

O₂

Multi-Level Dive Planner

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Marine Life

Various

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Location

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Dive Site Hazards

Bubble Trapping Under Overhangs — Rock overhangs can trap exhaled bubbles, reducing visibility and causing disorientation.
Reflected Surge Patterns — Surge reflecting off rock faces can create irregular and unpredictable water movement.
Current Funnel Effect — Narrow gaps between rocks can accelerate water flow unexpectedly.

Thermocline Buoyancy Shift — Sharp thermoclines can cause sudden buoyancy changes.

Instant Visibility Collapse — Sediment disturbance can eliminate visibility immediately.

Late Detection of Structures — Submerged structures may only appear at very close range.

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