Exactly!
Had a huge scare last night after I got it working again. I had been "in the basement" making PCBs for a long time, then I went up to the outdoor farm and an flying invisible spider attacked me. I wasn't really prepared for monsters as the compound had been monster free for so long. Anyway, I started running away and a giant Zombie appeared. Not sure how he got in there, maybe a ghast... Anyway, he hit me and was down to 1/2 a heart. I made it into the shuttle, blocked the door with Dust and sighed a huge sigh of relief.
But then I realized I still heard the spider noise.
Turns out the spider had SOMEHOW gotten into my shuttle through the 1-wide door! How is that even possible? Anyway, it killed me and I sync'd down in the basement. I clicked the empty shell and it started making a new me, as I sat there and rifled through the emergency "So you just died, eh?" chest and got a few basic pieces of gear equipped. I kept hearing the darned spider making its annoying noises, but I couldn't see it in the shuttle when I peeked up the ladder a few times.
Then, I turned around and saw the outline of the invisible spider IN THE BASEMENT with me! I shot it with an arrow as it came for me and then hit it with a pick. I was down to three hearts when I killed it!
Got upstairs, broke open the gravestone and then walled myself into a corner while I waited for my clone to form.
Too close for me!
Never did figure out how the spider and giant zombie got in, or how the spider got inside the shuttle and then down into the basement. Yike!