The data might be recoverable, depending on what model MBP you have (classic or retina).
If it is a classic MBP (before 2012), then you simply have to pull out the harddrive and connect via sata to another computer to see if the data is able to be read.
If it is a retina MBP, you might have a little more difficulty, but pull out the SSD blade and buy an external enclosure for it (one that you can connect via usb or thunderbolt).