1‘he sought to infiltrate the smuggling operation’
penetrate, invade, intrude on, insinuate oneself into, worm one's way into, sneak into, slip into, creep into, impinge on, trespass on, butt into
informal gatecrash, muscle in on
2‘mineral solutions infiltrate the rocks’
permeate, penetrate, pervade, filter through, percolate through, spread through, seep into, seep through, soak into, flow into, pass into, get into, enter
We take a look at several popular, though confusing, punctuation marks.