If I have a known *.mat file format but a corrupted *.mat with multiple errors, is there a simple way to recover the corrupted file?

Greetings,

I have a long-term data collection process going on, taking data every ~30 seconds. I've got numerous good files with the exact same variable (a simple matrix, 46 rows, by time-determined columns), all in double. However, one of them got corrupted due to a java heap overflow during one particular run of the test. None of the easily searchable corrupt-mat-file recovery tools was able to recover it, and when I use MATCAT, it shows multiple errors in the file:

>> matcat('B9.mat')
MAT-File Corruption Analysis Tool (MATCAT) version 2, February 2005
file 'B9.mat' opened successfully
numeric data in this MAT-File does not need to be endian-swapped when read on this computer
MAT-File header:
[MATLAB 5.0 MAT-file, Platform: PCWIN64, Created on: Fri Aug 04 00:59:08 2017                                        ]
this MAT-File does not have subsystem data (not all MAT-Files have this)
128 byte v5 MAT-File header ok

variable 1 TAG: datatype_0 (UNKNOWN-OR-ERROR), data bytes: 0

error - incorrect data type, file appears corrupted

error - incorrect number of data bytes

MAT-File integrity check FAILED for (B9.mat), 1 variable(s) found

ans =

       0

Is there a way of using the known file structure, and perhaps taking guesses at the true length of the data included in the file to recover the data? Or, are there other *.mat recovery tools that might be more successful? I've tried MATZEROFIX, and splitmat, neither was able to do anything. Thanks in advance.