Lord Shiva has agreed to perform consecration to Lord Vishnu. Therefore, consecration is performed to the Sphatika Lingam present inside the sanctum sanctorum. One view is that the Sphatika Laingam was instituted by Adi Sankara and yet another view states that the Sphatika Lingam was established by Sri Narasimha Bharathi Swamy of Shringeri Mutt.