'Ganapati Bappa Morya' (Praise the Lord) are the cries that Mumbai will reverberate today with, to mark the end of the Lord Ganesh festivities. All the idols will be immersed today.
P.S. In response to Carol - Hindu deities are seen to be accessed through points of symbolic focus known as murtis. For this reason, the immersion of the murtis of Lord Ganesha in nearby holy rivers is undertaken since the murtis are acknowledged to be only temporal understandings of a higher being as opposed to being 'idols,' which have traditionally been seen as objects worshipped for their own sake as divine.