If no one other will come here and help you, you can try my advice at your risk (maybe loosing all data).
I am on a Mac, so I don’t know how Windows will behave, if you use Windows.
There is an application Testdisk or Photorec http://www.cgsecurity.org/ they also have a step by step guide, when you click on the left side of the website on the apps name.
I used it, when I accidentially formatted a drive. It could get all 1,6TB of data back. (your case is different though, because, hardware encryption might get in the way anyway, but read on first).
You need another (empty) hard drive of the same or bigger size, so that it has something, where it can store the restored data (obviously not on the broken drive), if you have a bigger drive, that still has enough space left, then create a folder with a name you can remember well.
In case your target drive is not empty and you have instead created a folder: when you are then going through the steps be sure to select the folder itself as target (not the root Drive/Volume with all the other data on the drive).
First read all the steps in the Testdisk/photorec guide and then if you have questions come back here. I can’t help you with windows and for Mac I am no advanced person regarding “Terminal”-App (Console on Windows), too, so there are people, who will be able to help you better. If you can’t find other people here, try in another forum. If you are a mac user and need further help to understanding Testdisk/photorec I sugguest the macrumors.com forum.
But first wait, if there are people who can tell you to re-initialize the drive! (You could also try and phone the WD support).
There is a problem though. the passport series of WD is always encrypted under the hood, no matter, if you had “activated” it and saved a password. This fact makes it hard to restore these drives (or use another controller, when it is dead). But I wish you luck, that the data can be still read.
If you are in for a new drive, I reccomend a WD elements / elements portable, it has no hardware encryption. In some countries it has less warranty than the passport version, but I think this makes up for the readability of your data in emergency cases. (In the EU there seems to be a 3-year warranty version (instead of 2-years) of the WD elements, from time to time.)
Lastly maybe WD has an additional data recovery service for extra money?
Edit:
Oh, and there are people that say if a drive is defective, don’t try reparing it or so, just start getting your data directly. This of course depends on the case. So wait for the experts! They can also tell you, if using Testdisk to repair is a good idea, or if you should start immideately with Photorec (the name is photorec, but it recovers al sorts of files). You could try, when you open Photorec, if you even see your WD passport drive as a “source” option.