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This talk will present an overview, from the upper crust to the mantle transition zone, of recent results of the nBOSS project, which involved a deployment of 46 broadband seismometers in the Malaysian state of Sabah between March 2018 and January 2020. Using the data recorded by these instruments, together with those from a further 24 seismometers that form part of the MET Malaysia permanent seismic network, we have used a suite of seismic imaging techniques to investigate the structure of the crust and mantle, including surface and body wave tomography, shear wave splitting, receiver functions and virtual deep seismic sounding. These results reveal the underthrust Dangerous Grounds crust beneath the Crocker Range, crustal thickness variations that bear signatures of collisional orogeny and subsequent extension, remnant proto-South China Sea slab material in the mantle, a lithospheric drip to the south east that appears to be linked to subduction termination, and a complex MTZ, showing a clear distinction between Sabah and the rest of Borneo. |