Deployed in:   April 2001
Location:   Lat. N27 12.814' , Lon. W80 02.329', within the Sirotkin permitted reef area
Depth:   100 feet
Profile:   14 feet
     
Materials:   Concrete tetrahedrons

The Tetrahedron Patch and Stack Reefs are constructed of solid, pyramid-shaped concrete modules specifically designed for artificial reef construction. The tetrahedrons form a stable base for marine life that resists wave forces and encourages the proliferation of aquatic communities. The Stack Reef, which is essentially a small mountain of tetrahedrons, is believed to be the deepest installation of tetrahedrons in Florida.

Although diving is possible at the tetrahedron reefs, they are primarily known for fishing. Their high population of baitfish such as mackerel scad and tomtate draws a wide array of pelagic species, which continue to grow in diversity and number as the reefs mature.

In 2005, several Reefmaker patch sites were added to the Sirotkin reef zone north of the Tetrahedron Patch reef site.