> The pressure difference is one bar, so duct tape is more than enough to hold that.

This is something I have to consciously remind myself of a lot when thinking about space technology. I have this reflex-like feeling that "the vacuum of space" must be a huge obstacle. But then one remembers that 1 atmosphere is the equivalent pressure of a water depth of 10 m. This always blows my mind. In some sense, humans do live naturally pretty close to one end of an absolute scale (pressure). Dealing with near-0 temperature is hard. Dealing with near-0 spatial distance is hard. Dealing with 0 pressure is actually not that hard in the grand scheme of things.

This reminds me of one of my favorite Futurama lines as their ship is going underwater:

"Dear lord! That's over 150 atm of pressure!"

"How many atmospheres can the ship withstand?"

"We'll, it's a spaceship, so I'd say anywhere between 0 and 1."

https://youtu.be/Ewu-zHH5Qwg

Space craft are run at much less than 1 atm.

The ISS and all spacecraft that dock with it run at 1 atm. Which is nearly all currently flying spacecraft. (And probably Shenzhou does too, since it's basically a Soyuz.)

I'm surprised. I read somewhere that Apollo etc. were at fractions of an atm.

Apollo-era spacecraft were at about a third of an atmosphere when in space.

That doesn't change the fact that the external pressure they are designed for is 0 to 1.

Exactly! One of my preferred scenes in The Martian is when he repairs his blown airlock with duct tape, a thin tarp and a tension belt.