https://www.popularmechanics.com/military/navy-ships/a14783891/someone-left-a-hatch-open-and-crippled-indias-dollar29-billion-submarine/#:~:text=Someone%20Left%20a%20Hatch%20Open%20and%20Crippled%20India's%20%242.9%20Billion%20Submarine,-Jan%208%2C%202018&text=India's%20first%20ballistic%20missile%20submarine,a%20year's%20worth%20of%20repairs.
