Indonesian Navy TNIAL Nagapasa-class/Type 209/1400 submarine, KRI Alugoro (405), seen recently from tall ship KRI Dewaruci

Indonesian Navy TNIAL Nagapasa-class/Type 209/1400 submarine, KRI Alugoro (405), seen recently from tall ship KRI Dewaruci

Probably around Java Sea or Madura Strait