There are different theories on how water could enter the tank. At the time, workers were cleaning pipes with water. Some claim that because of bad maintenance and leaking valves, inferior components were used in the making of machines, and also low maintenance of the machines made it possible for the water to leak into tank 610. In December 1985 the New York Times reported that according to the plant managers the hypothesis of this route of entry of water was tested in the presence of official investigators and was found to be negative. UCC also maintains that this route was not possible and that it was an act of sabotage by a "disgruntled worker" who introduced water directly into the tank. See also,http://www.hindustantimes.com/bhopal/cbi-probe-into-gas-tragedy-baseless-and-malicious-says-counsel-of-indian-convict/story-cCzHAuxf6V6bA6vYFwFwPL.html