The Pirates' relievers have voluntarily invited live sharks into their clubhouse

On Tuesday, closer Jason Grilli explained to MLB.com's Steven Petrella why the Pirates 'pen have dubbed themselves the "Shark Tank" this season. Pittsburgh relievers lead the NL with a .212 batting average against and are tied for first with a 2.74 ERA. But most importantly, as Grilli notes, "they look for the smell of blood and go in for the kill."

Well, this week, an actual shark tank has been installed in the PNC Park clubhouse. Seriously. SHARKS! But just how big? How fierce?

Will the Pirates need a bigger clubhouse?

Will the shark then eat the bigger clubhouse?

Photo via spectrumculture.com

And are players in danger?

Well, probably not ...

-- Matt Monagan / MLB.com

Main photo via 3brothersfilm