Section 4 Gravity Block was the room in which MB's original body was stored in Sector Zero in Metroid: Other M.
Named on a hologram in the Bioweapon Research Center's main room, MB's android body informed Samus Aran about Project Metroid Warriors when they reunited in the center. A hologram was projected from the room's main computer displaying information about the room including multiple issue reports, but a message repeatedly stated that no issues are detected.
Samus never got to explore this room as Adam detached the sector rather than her.
Screen text
"Section 4 Gravity Block
Levels 12-17
Report issue 0041
Report issue 00"
"System check complete
Report issue 0070
No issues detected"
"Report issue 0006
Temperature 9°C ~ 11°C
Humidity 5% ~ 8%"