range. The lighthouse has (RACON (Code 'G') ii DGPS station) with a 300 mm 4 panel revolving light inside a 2.5 m diameter lantern house (BBT). It is an important landmark on the international shipping lane Colombo-Singapore route via Malacca Strait that passes south of Indira Point. It also has a helipad. 2004 tsunami The tsunami which resulted from the Indian Ocean earthquake of 2004 inundated much of the area. This partly damaged the lighthouse, which subsided 4.25 m. As a result of this subsidence, the coast retreated and the sea moved permanently inland. The lighthouse has since been repaired. The base of the lighthouse was 5 m above sea level when constructed in 1972. After the tsunami, the sea rose and the base was less than a metre above the sea level, showing over 4 meters of sea floor subsidence. It has been observed that the sea is slowly retreating back to its original position and the subsidence has decreased as the ocean floor slowly bounces back partially, a similar drop and rise due to crustal decompression and recompression was observed in the 2011 Tōhoku earthquake and tsunami on Honshu. Indira point was mostly submerged. See also Andaman Sea List of extreme points of India Extreme points of Indonesia Image gallery References "Nicobar completely devastated" – from rediff.com 2001 Census – from the Andaman & Nicobar Police Great Nicobar Biosphere Reserve Islands of the Andaman and Nicobar Islands Nicobar district Tehsils of the Andaman and Nicobar Islands