OHHHHH this example explains a lot!
First of all, this photo is not underexposed. It is actually overexposed, which is why you lost detail in that circle on the podium.
The yellow cast you are experiencing is caused by the lighting. The film you were using is color-balanced for daylight. If you are going to be shooting under tungsten light like this, then you should either use a tungsten-balanced film or get an 80A filter for your lens. The former of the two options is preferable because the filter will force you to use a longer exposure, and it seems you're already having problems with that. But both of those options will give you more accurate color reproduction under lighting like this.