Removing Drain Covers.

Hello Folks:

I was not sure where to place this topic, but since this is definitely non-HYIP (General Talk), I thought I might take a gamble and roll the dice; trust me, this is not intended to be spam. Here goes: Does anyone here know of the best type of equipment and/or power tool(s) used to help remove either of these tightly sealed drain covers? Keep in mind that these drain covers are not SCREWED/NAILED IN, but SEALED IN.

https://i.imgflip.com/5a2gxy.gif

My bosses and I attempted to remove these drain covers with hand tools, but of course, they would not work. Truth be told, I knew that it was going to be a lost cause anyway with those tools; I just did not feel like clashing with my so-called omniscient bosses. So does anyone know what I can use to open those drains and where I can find it? Thank you very much in advance for the advice.

Me :help: :waiting: :eek: :confused: