The pyramid substructure was accessed from slightly above ground level on the middle of the pyramid's north side.
A descending corridor, deflected slightly to the south-east, led to the funerary apartments.
The corridor was reinforced with red granite near its terminus, and guarded by a red granite portcullis.
In the middle of the corridor was a further security measure in the form of a massive red granite interlocking "jaw[-like]" barrier.
A barrier of this type has not been verified in any other building, but appears to have been included due to the lack of protection for the tomb from above.
The corridor terminates at an antechamber, with a burial chamber lying further to the west.
The rooms are oriented along the east-west axis and each apartment was originally covered by a gabled fine white limestone ceiling.
These have been severely damaged by stone thieves quarrying inside the pyramid who had easy access to the chambers from the roof terrace where they dug a ditch and set up a workshop.
The pyramid was likely plundered in the First Intermediate Period, and then periodically mined for stone from the New Kingdom through to the nineteenth century.

In spite of the devastation wrought by stone thieves, remnants of the burial have been preserved.
Inside the substructure fragments of a red granite sarcophagus, pieces of four alabaster canopic jars, alabaster sacrificial offering containers, and a partial mummy were recovered.
The sarcophagus was covered by a convex lid with rectangular end pieces, had body walls 35 cm (1 ft 2 in) thick, and a length of no more than 2.7 m (8.9 ft).
The red granite build is noteworthy, as Fifth Dynasty sarcophagi were typically made of greywacke.
This suggests that Neferefre's sarcophagus was most likely an emergency solution.
The mummy remains have been identified as belonging to a twenty to twenty-three-year-old male, probably Neferefre.
Blocks from above the gabled ceiling also regularly contain an inscription reading Hut Neferefre approximately "Burial area of Neferefre".
At the end of the corridor, a block with a date rnpt sp tpy, ꜣbd 4 ꜣḫt was uncovered, corresponding to the first or second year of Neferefre's reign, or assuming a biennial census then theoretically a third year, and briefly preceding the interruption of the pyramid construction process.
The pyramid substructure was accessed from slightly above ground level on the middle of the pyramid's north side. A descending corridor, deflected slightly to the south-east, led to the funerary apartments. The corridor was reinforced with red granite near its terminus, and guarded by a red granite portcullis. In the middle of the corridor was a further security measure in the form of a massive red granite interlocking "jaw[-like]" barrier. A barrier of this type has not been verified in any other building, but appears to have been included due to the lack of protection for the tomb from above. The corridor terminates at an antechamber, with a burial chamber lying further to the west. The rooms are oriented along the east-west axis and each apartment was originally covered by a gabled fine white limestone ceiling. These have been severely damaged by stone thieves quarrying inside the pyramid who had easy access to the chambers from the roof terrace where they dug a ditch and set up a workshop. The pyramid was likely plundered in the First Intermediate Period, and then periodically mined for stone from the New Kingdom through to the nineteenth century.
In spite of the devastation wrought by stone thieves, remnants of the burial have been preserved. Inside the substructure fragments of a red granite sarcophagus, pieces of four alabaster canopic jars, alabaster sacrificial offering containers, and a partial mummy were recovered. The sarcophagus was covered by a convex lid with rectangular end pieces, had body walls 35 cm (1 ft 2 in) thick, and a length of no more than 2.7 m (8.9 ft). The red granite build is noteworthy, as Fifth Dynasty sarcophagi were typically made of greywacke. This suggests that Neferefre's sarcophagus was most likely an emergency solution. The mummy remains have been identified as belonging to a twenty to twenty-three-year-old male, probably Neferefre. Blocks from above the gabled ceiling also regularly contain an inscription reading Hut Neferefre approximately "Burial area of Neferefre". At the end of the corridor, a block with a date rnpt sp tpy, ꜣbd 4 ꜣḫt was uncovered, corresponding to the first or second year of Neferefre's reign, or assuming a biennial census then theoretically a third year, and briefly preceding the interruption of the pyramid construction process.
Pyramid of Neferefre