So I had this idea the other day while I was surfing the internet. The reason I'm posting it here is because I feel like maybe this will help some who might have writer's or artist's block, and also I don't really have the time or energy to make such a comic myself.
So my idea is similar to Hunt for The Red October if you've ever seen that movie, however it'd take place in modern/slightly future america (by like maybe a decade or so in the future from now). Tensions between the United States and Russia have skyrocketed in the past decade and Russia has come up with a new nuclear weapon called "Poseidon" which is essentially a TZAR Bomba that is strapped to the front of an unmanned submarine. Its capabilities are absolutely horiffic, it can park itself in San Francisco Bay or Manhattan Island and just detonate and flatten the whole city in less than a second.
Russia would have a bunch of these basically swimming around in the oceans and the main character of this story is a captain in the US navy who's tasked with the seemingly impossible feat to find all these Poseidons and secretly deactivate all of them before there's an escalation that leads to one of them being used and WWIII is set off over it.
If you want more info about what a TZAR Bomba is
if you want more info about what a Poseidon is