THIRUVANANTHAPURAM: Opposition leader VD Satheesan on Tuesday said that he had sent a letter to the Tamil Nadu Chief Minister seeking support for the construction of a new dam at Mullaperiyar to ensure the security of Kerala. In his Facebook post, Satheesan said that Kerala is concerned about the safety of the existing dam at Mullaperiyar as the dam has filled up to the brim due to the unprecedented rainfall in October.