Inspired by this and the following chat:
Your task is to output the following:
_ _ _
/_/_/_/\
/_/_/_/\/\
/_/_/_/\/\/\
\_\_\_\/\/\/
\_\_\_\/\/
\_\_\_\/
Extra leading or trailing whitespace is allowed, as long as it does not change the appearance of the cube. As usual, returning the above or a list of strings from a function is allowed.
This is code-golf, so shortest answer in bytes wins!