Make sure you’ve been infected with the husk parasite. The most common way to get infected is an encounter with an active husk, but some well-equipped laboratories and research facilities may also house dormant husk eggs.
Once infected, you may have trouble swallowing and your throat may feel sore. It is generally not a good idea to tell your fellow crew members about these symptoms, as it would most likely lead to a medical inspection and a dose of antiparasitic drugs. As the parasite grows, you may also find it hard or impossible to speak. If so, try to stay away from other people to prevent arousing suspicion.
When the parasite reaches maturity, it extends its ovipositor out of your throat. The feeling may be somewhat unpleasant. At this stage it is highly recommended to wear a diving mask or other headgear to hide the ovipositor from the rest of the crew.
The parasite will slowly start taking over your entire nervous system, but this process can be delayed by working together with the parasite by spreading eggs into new hosts. Just find a suitable target and gently insert the ovipositor into one of their body cavities.