We've definitely seen Beyonce "take the plunge" before.
At the 2014 Met Gala:
At the Chime For Change charity event:
At the 2014 VMAs:
You get the point. But it looks like Beyonce actually took the plunge, as in jumped off a boat into water, as shown in an Instagram photo posted Wednesday:
We can't really tell if her swimsuit has a plunging neckline, but Beyonce takes the plunge while taking the plunge? That's some "Inception"-type stuff.
CORRECTION: A previous version of this article misidentified the prominence from which Beyonce dove as a cliff. She jumped off a boat.