Why do Indian ships moving betwewn …

Whenever we talk about domestic territory of a country then it talks about that places in which a country's economic activities are going on but the only condition is that activity must be operated by indians and as per your question indian ships are moving between india and japan so it is an economic activity of india that's why it is counted in the domestic territory of india. And for your knowledge: jo kaam humari country k log kr rahe hai but in two different countries so think that work can't be done in our country jaise reliance company america se japan k airplanes ko operate karti hai to khud socho ki kya wo kaam india me ho skta tha nahin na to fir lekin wo tha to india ka hi economic work isliye wo humari country me count hoga ?