The ashes of late Shiv Sena supremo Bal Thackeray were today immersed in the Arabian Sea by his son and party executive president Uddhav Thackeray. Maharashtra Navnirman Sena president and Bal Thackeray's nephew Raj Thackeray was also present at the Gateway of India, where the family had gathered to immerse the ashes. The 86-year-old Sena patriarch died on November 18 at his residence Matoshree after a prolonged illness.