system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 why submarines use nuclear power, but this isnt more commonly used on land?

I understand the fear of meltdown but how is it it isn't an easy fix,and is that the main reason why?
gpt
Nuclear power is especially beneficial for submarines because it means they do not have to refuel or surface for air (for a very long time). This makes it much easier to operate in secret. No alternative to nuclear power offers this benefit. On land, that concern does not exist.