The tunnel alignment is now part of Taguig's Bonifacio Global City district and the Embo barangays, and is considered a historical site by the Bases Conversion Development Authority (BCDA).
It stretches 2.24 kilometres (1.39 mi) at an average depth of 70 feet (21 m) that spans from the Pasig River, to the area now called Pembo and East Rembo.
They immediately captured Fort McKinley, turning it to one of their important installations and renaming it Sakura Heiei (Cherry Blossom Barracks).
As the US Air Force started bombing Manila, the Sakura Heiei's tunnel served as shelter of the high military officials.
In 2023, the Embo barangays of East Rembo and Pembo were removed from Makati and transferred to Taguig in accordance of a Supreme Court ruling that places the entire Fort Bonifacio area, as well as the tunnel, under the latter city government.