161gb no aparecen en diskutil después de borrar la segunda partición de OSX

He borrado mi segunda partición de OSX y me faltan 161gb de espacio. No aparece en diskutil ni en Utilidad de Discos. Tengo que mantener la partición Untitled2 porque almacena archivos que necesito.

lista diskutil

/dev/disk0 (internal):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                         500.3 GB   disk0
   1:                        EFI EFI                     314.6 MB   disk0s1
   2:                 Apple_APFS Container disk1         172.5 GB   disk0s2
   3:                 Apple_APFS Container disk2         167.6 GB   disk0s3

/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +172.5 GB   disk1
                                 Physical Store disk0s2
   1:                APFS Volume Untitled2               141.5 GB   disk1s1

/dev/disk2 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +167.6 GB   disk2
                                 Physical Store disk0s3
   1:                APFS Volume Macintosh HD            108.3 GB   disk2s1
   2:                APFS Volume Preboot                 45.0 MB    disk2s2
   3:                APFS Volume Recovery                512.8 MB   disk2s3
   4:                APFS Volume VM                      1.1 GB     disk2s4

diskutil apfs list

APFS Containers (2 found)
|
+-- Container disk1 4CA49CB7-0B51-487F-AC91-843A00AACD56
|   ====================================================
|   APFS Container Reference:     disk1
|   Size (Capacity Ceiling):      172464693248 B (172.5 GB)
|   Capacity In Use By Volumes:   141663903744 B (141.7 GB) (82.1% used)
|   Capacity Not Allocated:       30800789504 B (30.8 GB) (17.9% free)
|   |
|   +-< Physical Store disk0s2 D50CC799-F508-4BC3-99B7-D88453067192
|   |   -----------------------------------------------------------
|   |   APFS Physical Store Disk:   disk0s2
|   |   Size:                       172464693248 B (172.5 GB)
|   |
|   +-> Volume disk1s1 8FC2013D-3475-4D7A-B782-34120455DBEA
|       ---------------------------------------------------
|       APFS Volume Disk (Role):   disk1s1 (No specific role)
|       Name:                      Untitled2 (Case-insensitive)
|       Mount Point:               /Volumes/Untitled2
|       Capacity Consumed:         141533384704 B (141.5 GB)
|       FileVault:                 No (Encrypted at rest)
|
+-- Container disk2 525596F2-BF28-4B79-8A69-980E08DCA7B8
    ====================================================
    APFS Container Reference:     disk2
    Size (Capacity Ceiling):      167607386112 B (167.6 GB)
    Capacity In Use By Volumes:   110029500416 B (110.0 GB) (65.6% used)
    Capacity Not Allocated:       57577885696 B (57.6 GB) (34.4% free)
    |
    +-< Physical Store disk0s3 E0DF7FC9-10C9-48EB-B1D3-955CF2604696
    |   -----------------------------------------------------------
    |   APFS Physical Store Disk:   disk0s3
    |   Size:                       167607386112 B (167.6 GB)
    |
    +-> Volume disk2s1 1AD64FB4-1024-4B39-9429-B4A7493D28D7
    |   ---------------------------------------------------
    |   APFS Volume Disk (Role):   disk2s1 (No specific role)
    |   Name:                      Macintosh HD (Case-insensitive)
    |   Mount Point:               /
    |   Capacity Consumed:         108267294720 B (108.3 GB)
    |   FileVault:                 No (Encrypted at rest)
    |
    +-> Volume disk2s2 BB7D5886-DEB8-4044-BD11-477B9241B902
    |   ---------------------------------------------------
    |   APFS Volume Disk (Role):   disk2s2 (Preboot)
    |   Name:                      Preboot (Case-insensitive)
    |   Mount Point:               Not Mounted
    |   Capacity Consumed:         44994560 B (45.0 MB)
    |   FileVault:                 No
    |
    +-> Volume disk2s3 E0FCF8A4-B9EE-4933-A159-01FE53268518
    |   ---------------------------------------------------
    |   APFS Volume Disk (Role):   disk2s3 (Recovery)
    |   Name:                      Recovery (Case-insensitive)
    |   Mount Point:               Not Mounted
    |   Capacity Consumed:         512753664 B (512.8 MB)
    |   FileVault:                 No
    |
    +-> Volume disk2s4 0C55D779-851D-4F4A-BB98-31480E17A910
        ---------------------------------------------------
        APFS Volume Disk (Role):   disk2s4 (VM)
        Name:                      VM (Case-insensitive)
        Mount Point:               /private/var/vm
        Capacity Consumed:         1073762304 B (1.1 GB)
        FileVault:                 No (Encrypted at rest)

diskutil info disk0s2 | grep -e Offset -e Size

   Partition Offset:          160205692928 Bytes (39112718 4096-Byte-Device-Blocks)
   Disk Size:                 172.5 GB (172464693248 Bytes) (exactly 336845104 512-Byte-Units)
   Device Block Size:         4096 Bytes

diskutil info disk0s3 | grep -e Offset -e Size

   Partition Offset:          332670386176 Bytes (81218356 4096-Byte-Device-Blocks)
   Disk Size:                 167.6 GB (167607386112 Bytes) (exactly 327358176 512-Byte-Units)
   Device Block Size:         4096 Bytes

La información anterior se puede resumir en la siguiente tabla.

starting sector  ending sector  # of sectors  identifier
---------------  -------------  ------------  ---------- 
                                     ~76,806  disk0s1
     39,112,718     81,218,355    42,105,638  disk0s2
     81,218,356    122,138,127    40,919,772  disk0s3

Número total de sectores = ~122.143.554. Hay 4096 bytes por sector.

El mayor bloque de espacio libre se produce antes de disk0s2 y disk0s3 y se puede aproximar mediante la ecuación que se muestra a continuación.

(39,112,718 - 76,806) * 4096 = 159,891,095,552 bytes.