Q: I think I blew the motor, I went through a deep puddle if water.

So yesterday it was raining really hard, I drove through a huge puddle of water. I thought I could go through it because there was a car going through it in front if me. When I was in the mist of it all I realized just how deep it was. Well after I drove out of it my car shook a lot and the engine light went on. I turned the car off and tried to restart it but it turned off. I thought it was a bit of water so I pushed it and parked it. This morning I checked and there's water in the air filter. It won't start and I jacked it and noticed oil spilling out. There's a huge hole in the bottom. I think my engines done, but I'm not completely sure. What can I do, should I take it to a mechanic or just replace the motor?