Indian Prime Minister Narendra Modi on Friday commissioned the country's first indigenous aircraft carrier "Vikrant" in the southern state of Kerala.Vikrant is the largest warship ever built in India, which was named after India's first aircraft carrier, the Indian Navy said in a statement.The Indian navy said it took 13 years to build Vikrant, which has a total displacement capacity of around 43,000 tons when fully loaded.Indian Prime Minister Narendra Modi on Friday commissioned the country's first indigenous aircraft carrier "Vikrant" in the southern state of Kerala.Vikrant is the largest warship ever built in India, which was named after India's first aircraft carrier, the Indian Navy said in a statement.The Indian navy said it took 13 years to build Vikrant, which has a total displacement capacity of around 43,000 tons when fully loaded.