Please don't attempt to drive through water this deep.
It's highly unlikely it would affect the battery pack (or lead to electrocution - a common electric car myth), but other electronics within the car are susceptible to water intrusion.
And it's not safe to drive through water when you can't see how deep it actually is.
"Water? No problem."
For good measure will add in this original, super-deep water test via Nissan Japan (via DanCar) as well