It is also emerging that the "modernization" of the Nagapasa (3) and the possible acquisition of second-hand Tupi -class submarines (2 + 2) with, here too, a mid-life renovation project - transforming the seven submarines into Type 209/1400 Mod - could be favorably presented in light of a standardization of the main large equipment, from sensors to effectors, with the latest proposal: a proposal for the construction under license of three Type 214/1800 submarines is also put forward by the manufacturer.