Founder member, Chakrvarty died suddenly in 2009, due to heart attack. Sen released his first solo debut album "Depths of the Ocean" in 2011, an album which had been in the making for the last ten years. Featuring collaboration with Shubha Mudgal, Nitin Malik, Papon, and Asheem Chakravarty. In 2012, he started touring with a new setup of artistes, called "The Susmit Sen Chronicles", which included drummer Nikhil Vasudevan, bassist Anirban Ghosh, tabla player Varun Gupta and vocalists Amit Sharma and Sudhir Rikhari. Thereafter Sen left Indian Ocean in June 2013, to pursue his solo career. However, he joined the Indian Ocean for a farewell tour in end 2013, thereafter he was replaced by guitarist Nikhil Rao.