I cannot possibly be the first to know about this, but I haven't seen another Guide on it yet. If one already exists, I can take this one down, just let me know!!!

I have only tried this on Singleplayer saves so far. This interaction should be a Vanilla interaction, as none of my mods modify Talents in any way, shape, or form. but if my understanding of its functionality is wrong, please let me know right away and I will edit this guide accordingly.

Barotrauma is designed to be a game where you make friends and enemies as you navigate the hostile Europan waters, so for some people, using the following technique could break immersion, ruin the narrative impact of picking missions that lower reputation with certain factions, or remove the challenge (or fun, depending on who you are) of being enemies with other humans. This method can very easily be used to take intended consequences away from the game - you are supposed to become less liked by the Separatists every time you sink one of their subs, for example, but if you can make back 100+ reputation from a single mission, what's stopping you from committing mass murder and then undoing the consequences? - and as such, I am hoping you will use these techniques responsibly, and hopefully, to make friends. The title of this guide isn't "How to get away with genocide", after all... but then, it can be quite fun to fill things with lead until they don't breathe, so if that's how you have fun, I won't tell you not to (sorry to all the NPCs whose deaths will go unavenged because of this guide)! It is always completely optional for you to use the following methods.

Because this strategy messes with the consequences you can receive from the Reputation system, make sure all players are OK with it before proceeding in Multiplayer!!!

I write all that I write below to give you a way out of making even more enemies on an already hostile, alien moon. For those of you who neither want to aid an autocratic and corrupt regime, nor commit extremist acts against the organisation holding humanity together; who do not want to see or be part of the violence between these factions, who would rather not have to take up arms against their fellow humans (or sentient beings in general, in the off chance that you like the author of this here guide are not one), or simply fear for their lives that one or more of these factions may try to kill you... for those who want to mend some of the wounds in this world and reintroduce Europa to the concept of friendship and unity... you are thus shared the power to have no enemies (except for enemies you choose to have)!!!

The core talent of this entire strategy is "Protect and Serve", a first-level accessible Security Officer talent. The exact wording of Protect and Serve is: "Gain 30% bonus XP and 100% more reputation when completing a Escort mission." The bonus EXP is not the most important thing for our purposes - rather, it is the 100% more reputation. Functionally, what this Talent does is that it multiplies your Reputation gain by 2 (because 100% you get normally + 100% more = 200%), and indeed, that appears to be how it works in the code. Now, the wacky thing is that in my testing, this is multiplicative with itself, meaning if you have three Security Officers with this Talent, you actually get 2 x 2 x 2 = 8 TIMES the Reputation . That means that, for a simple Coalition Personnel Transport, giving +5 Europa Coalition Reputation and -5 Jovian Separtists Reputation, you can gain 40 Europa Coalition Reputation . Things become completely insane at and past this point - 5 Officers can give you 32X the Reputation, etc. You are effectively able to make more reputation than you lose, and by so much that you could generate enough Reputation in a single round to go from minimum Reputation to maximum Reputation (however, in practice, hostile factions won't exactly be offering you their missions, so try not to make anyone hostile who you haven't already resolved to be hostile against).

While the game is less dangerous and gives less difficult Escort missions - that meaning, the early game in the Cold Caverns and the Europan Ridge, you want to hire as many Security Officers as you possibly can, and quickly (but make sure to leave room to keep your crew well-rounded enough to function, or to do assistant-stacking shenanigans), just to have them all pick up Protect and Serve. Take on Escort missions while they are still simple (no hidden terrorists, no rioting Prisoners, etc.) to quickly max out your Reputation with any faction you want to befriend (I personally don't do the Cult many favors because I don't like them turning my friends into zombies, but neither am I at the point of blasting them on sight). Picking up the occasional Escort mission will keep you loved by any faction you wish to be friends with, so long as you don't sink like 4 of their submarines in a row or something.

If you are intending to play the long game, though, you don't need to rush Security Officers as hard, since you are more or less guaranteed one (or two!) if you want to befriend either one or both of the Europa Coalition and the Jovian Separatists. Ignatius May Victoria Petran respectively will join your crew for FREE once you reach Revered with either faction, I believe, though it might take a while for them to show up, and they can only join up at an outpost controlled by their faction, and they (being security officers) can ALSO take the Protect and Serve talent.

As a side effect of this, you may gain access to faction-exclusive vendor items sooner, you will get full Faction service discounts sooner, and you can recruit such ridiculous faction-specific crew combinations as Aunt Doris, Sootman, Jestmaster, and Jacov Subra! In theory. I've never tried to recruit Subra, the husk people scare me >_<