  A 12-m diameter radio telescope will be deployed to the Summit Station in
Greenland to provide direct confirmation of a Super Massive Black Hole (SMBH)
by observing its shadow image in the active galaxy M87. The telescope
(Greenland Telescope: GLT) is to become one of the Very Long Baseline
Interferometry (VLBI) stations at sub-millimeter (submm) regime, providing the
longest baseline > 9,000 km to achieve an exceptional angular resolution of 20
micro arc sec at 350 GHz, which will enable us to resolve the shadow size of
~40 micro arc sec. The triangle with the longest baselines formed by the GLT,
the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile, and the
Submillimeter Array (SMA) in Hawaii will play a key role for the M87
observations. We have been working on the image simulations based on realistic
conditions for a better understanding of the possible observed images. In
parallel, retrofitting of the telescope and the site developments are in
progress. Based on three years of opacity monitoring at 225 GHz, our
measurements indicate that the site is excellent for submm observations,
comparable to the ALMA site. The GLT is also expected to make single-dish
observations up to 1.5 THz.
