One detail that stuck with me from Rodamrix's stuff is how they handle non-verbal communication. So many authors rely on dialogue to build trust or create friction, but Rodamrix will write these long stretches where characters are just... working next to each other. Repairing a ship, calibrating a scanner, that kind of thing. The trust builds in the silence, in the shared focus, and the tension comes from a hesitation, a missed cue, or one character taking a risk the other wasn't ready for. It feels incredibly lived-in.
Their use of confined spaces is another big one. Trapped in an escape pod with dwindling oxygen, forced to share quarters on a long-haul freighter—these scenarios force proximity, and Rodamrix doesn't let the characters off the hook. They have to navigate that forced closeness, and the trust isn't about grand declarations; it's about who takes the first watch, who shares the last ration bar. The tension isn't always from external threats; sometimes it's just the sheer, unbearable weight of having no one else to rely on, and not being sure you can.
I think what makes it work is the lack of melodrama. The emotional beats feel earned because they're built on these small, practical moments of interdependence. You believe the ship because you've seen the nuts and bolts of it, literally and figuratively.