Don’t feel bad. How you are feeling is valid even if it isn’t always logical. You didn’t know these people and it can be hard to empathize with those in a very different situation as ourselves. It is sad they lost their lives but the risks were outlined when they boarded the sub. But you also don’t owe these people your emotions or energy. You don’t owe them to feel remorse for their deaths. Just feel your feelings as they come and don’t worry if you feel empathy for the people on the sub.