The nation will witness a landmark event in the history of indigenous warship building when two frontline warships of Indian Navy, Surat, a Project 15B Destroyer, and Udaygiri, a Project 17A Frigate will be launched concurrently at Mazgaon Docks Limited, Mumbai tomorrow. Defence minister  Rajnath Singh will be the Chief Guest for both the events.<br />''<br />''The Project 15B class of ships are the next-generation stealth guided-missile destroyers of the Indian Navy being built at the Mazgaon Docks Ltd, Mumbai. Surat is the fourth ship of Project 15B Destroyers which heralds a significant makeover of the P15A  Destroyers and is named after the commercial capital of Gujarat.    <br />''<br />''Udaygiri, named after a mountain range in the state of Andhra Pradesh, is the third ship of Project 17A Frigates. These follow the P17 Frigates Shivalik Class with improved stealth features, advanced weapons and sensors, and platform management systems. Under the P17A program, a total of seven ships are under construction. Various novel concepts and technologies like Integrated Construction, Mega Block Outsourcing, Project Data Management, and  Project Lifecycle Management have been adopted for the first time in indigenous Warship Design and Construction in this project. <br />