46.2Our dark laboratory: B minor

Start with B.

Natural minor:

B C♯ D E F♯ G A

Now alter scale degree 2 downward:

C♯ → C.

You get:

B C D E F♯ G A

That is B Phrygian.

Formula:

1 ♭2 ♭3 4 5 ♭6 ♭7