Let's say that we have a gaseous or liquidus compound (I don't know if elements or compounds make a difference, take this as a thought experiment), and we have a tungsten or steel block that's 5cm (or less, you choose) thick. Is there any physical method for that gas or liquid to pass through that thick heavy metal block (not by drilling etc.)?
This is for a science fiction setting, in which this gas or liquid needs to be "sealed" within a confined space for narrative reasons, but I want to understand whether this is at all possible through real-science.

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I'll assume that you mean a stationary situation, i.e., that you don't want the heavy metal block to move.

If the compound is a gas under normal conditions (temperature and pressure),
Or put it another way, is there any physically conceivable method for the gas or liquid to turn the tungsten or steel block into a gaseous or liquid form itself from the inside out?

This question was inspired by the "supercooler" concept. Is a supercooled state a solid under extreme temperature and pressure conditions, or it's still a liquid but with special properties, and can we achieve such extreme pressure and temperature in nature or in lab