Spiralize your cucumber and put it in a medium-sized bowl.
Cook your noodles as per the package instructions. Vermicelli noodles usually only take about 2 minutes to cook, so keep a close eye on them. When done, drain them and rinse them under cold water to cool them down. Shake off any excess water, and add to the bowl with the cucumber.
Drizzle the dressing into the bowl and toss the noodles and cucumbers to coat. Taste, and if you feel you need more, simply splash a bit of extra soy sauce in there.
Add the crab, avocado, nori, and toasted sesame seeds to the bowl. Gently toss to mix.