Ubuntu – Partition table lost – how to recover lost LUKS partition, I have some backup partitioning data

Thanks for choosing to take a look and help.

The problem is this:

I have a 1TB external hard disk with
One encrypted partition(about 286 gb) – luks (I'll call this EP)
One unencrypted partition(about 580 GB). – ntfs (i'll call this UEP)

The rest of the partitions were empty so they don't matter. I changed the UEP to "read only" in windows using "diskpart attributes volume set readonly". It seemed to work fine without issues, but after a short while there was some error and my partition table went missing partition manager said the whole drive was unalocated. So too did gparted and fdisk.

I tried using testdisk and it found all the missing partitions, When I wrote the recovered partition to disk, the UEP returned fine, but the encrypted partition is now inexplicably downsized to 2MB.

Fortunately I did some partition data backup earlier when I was trying to convert this from GUID to MBR, before all this and have some sector data which may help in recovery.

The Pre-Crash data created by Partition Wizard is Here (line 37/39 are the partitions I speak of).

The Post-Crash data is here (noticeably start of 37 and end of 39 match the luks partition from the Pre-Crash data)

The LUKS partition is this one:

letter: * PartID:  7 Start:   137117696 End:   737118207 Size:   600000512 FsId: 255 Label:                      ClusterSize:  -1 FreeSectors:           0 Primary: 1 Bootable: 0 BootVolume: 0 SystemVolume: 0

Is there any way to recover the LUKS partition while also keeping the 580 GB NTFS Drive?

I only need to recover the two drives that I have discussed here.

Please help me out with this.

-Danish