2013 Smart Passion Hole in Transmission

[dashford88]

Hello, first time poster, no time to write intro post unfortunately.

 

new owner of my first smart and was sold it private under impression it needed a new clutch plate actuator, and new belt (alternator was seized). I was under the car trying to replace the belt when I found a hole and cracked metal at the low-point on the transmission/clutch (unsure which part). It’s the lowest part of the engine and appears someone hit a rock and punctured it. 
 

the hole is the size of my pinky nearly and all the oil has clearly drained (not since I’ve owned it, but prior) 

 

Is there any way I can upload a video? Either way I can’t do much from here but ask, what part do I need to replace?