This all dogtag Tanker route features the Very Easy difficulty specifics done on the PC version of Substance.
For boss encounters/fights, we refer to the main game segments.

Start with three punches to buffer the guard at the top. His movement will be delayed for a faster 2nd dogtag.
After that go left and meet the first guard to get this dogtag. Afer that, follow up the stairs to meet the 2nd guard.
After having acquired the 2nd dogtag move on to the right and drop from the top behind or next to the third guard.
Hold him up, bump into him to get to his front and after grabbing the 3rd dogtag, move inside into Deck B.

Enter the room, get ready to skip the cutscene on walking in the shot hallway path.
Hold up this guard and get his dogtag.

Just follow the room and go up the stairs.

Follow the room as usual to the left to get to Olga. Or alternatively do the same as on Very Easy and Easy difficulty:

See here for how to do the Olga boss fight.

After having fought Olga, simple grab Olga and let go to get her dogtag.

After grabbing Olga's dogtag, go right and walk south past the left door to Deck-E, to meet the 2nd guard.

It is recommended to grab the Socom ammo pack in the top right corner of the room.

Walk down the stairs and turn left, get the socom ammo and hold up the guard to your left.
Make sure to be further away, since you need to shoot your socom to threaten this tough guy.
If you're too close to the door the next guard hears you.

After having acquired the dogtag, move right, wait at the door if necessary to have the 2nd guard turn right.
Simply walk up and hold up the guard, then get his dogtag.

Walk into the pantry to have the pantry guard spawn. This guard is a tough guy.
Walk back outside and get to the stairs that leave the Deck-D to Deck-C.
Hold up the pantry guard and threaten him with a Socom shot over his head.

Walk fast to hold up the guard As he is held up, shoot the camera out.
Now simply get the dogtag from the guard and move further down to Deck-B.

Walk down the stairs and follow the path south into the long hallway.
Get the guards attention and shoot out his exclamation mark to stun the guard.
Give him a wake up call by either punching or shooting once with the socom.
Hold up, get dogtag, move to the Deck-A Crew lounge.

Walk down the stairs at the left side of the railings to not get spotted.
Hold up the glas guard. While holding him up, you can either lean left of the guard,
or put your weapon down to get to the Socom and shooting the floor or wall behind that guard.
The goal is the get the stinky guard's attention so he starts walking up, saving you time.

After you received the glas guard's dogtag, put him to sleep with the M9 and walk left to meet the stinky guard.
Get the stinky guard's dogtag and then leave south to go to Deck-A Port.

Simply follow the path and get to the guard at the end of the right side of the hallway.
Hold up the guard and get the dogtag, then continue right to re-enter Deck-A crew lounge.

Here is why it matters that you put the previous guards to sleep. The 2nd visit guard is a tough guy,
so you need to shoot the socom to get his dogtag. Enter the room and turn left to get the snoozing guard's attention
and simply use the Socom and shoot above his head to get his dogtag. Afterwards leave to the engine room to the right.
Note: You can NOT do Prozac Skip to enter the engine room, as you will lose the guard who is fixing the left engine room door and his dogtag.

The longest stretch of getting dogtags.
The first guard is simple to hold up on entering the engine room, bump into him and turn around with auto aim.
Switch to FPV and hold the M9 into his face and he will drop his dogtag.

The next guard is on the level below. Depending on how fast you got the first dogtag, you can either walk south first
down the stairs and run after him, or you have to wait for him to walk past you, so you can sneak up to the guard.
Get his dogtag and walk south over the railing to drop down to the light guard.

This guard either looks left or right, use the radar to be sure to avoid detection, hold him up and get his dogtag.

Follow now the path through the engine room up the left central stairs to meet the binocular guard.
Simply bump into the guard to get between him and the railings to acquire his dogtag.

You have to move fast to meet the cycle of the left railing guard. Hold him up and tranq him after acquiring the dogtag.

Ideally the bottom guard should move up now to meet you at the higher level, so you can get the dogtag #6 in this room.

Finally, walk up the rest of the engine room and roll into the cutscene trigger to have the door being repaired.
If you're fast, you can shoot out the one engine room bomb sensor and THEN walk back to the now repaired door.
Alternatively you can first go south and get the dogtag from this guard and then take care of the sensors.

The first guard is your critical guard.
Walk up and watch a video reference to know when to distract the guard.
Either shoot to his side with the M9 so he will be turned.
Alternative you can shoot the guard with the socom twice, then hold him up as you almost walk through him.

After you got this dogtag, walk further up and get to the 2nd guard that listens to his music.
Do a PPK to time yourself, then hold up the music guard and get his dogtag. While he shakes off,
you can get the extra socom ammo to his left.

Alternatively if you're fast, when holding up the first guard and getting his dogtag, you can walk further up,
to trigger the music guard earlier.

After having acquired the 2nd dogtag, you can get the final dogtag from the snoozing guard.
Simply walk up and hold him up, get the dogtag and leave to the right.

Simply follow the path.

See here for Guard Rush tactics.

Perform your preferred method to go down the two ladders.
You need to get the projector guard and the bottom left extra guard's dogtags.
Use the usual strategy to walk south around the projector guard.
Wait at the box for the extra guard to get close to the projector guard.
Ideally you hold them both up at the same time, get their dogtags and take a continue to start from the top again.

For the 2nd guard, you preferably need to use the ladder glitch to move through the Holds 1 faster.
But you can also just hang from the ledge and get to that top right guard at the door that holds your 2nd dogtag.

For performing the ladder glitch for just one level, have the M9 equipped and start the glitch as usual.
By doing a ppk and equipping the camera, then press triangle to get on the ladder.
Afterwards just mash triangle (easy pace) and hold dpad forward. You should be now at the middle level of the ladders.

Now you can perform another ladder glitch, this time just get on the ladder. (ppk + camera + triangle).
This will have Snake hop forward. You can hop with this method to the end of the Holds 1 to meet the door guard.
Make sure the guard is walking left, by waiting for shooting with the M9 to distract him. Technically you are out of bounds.
Once you're inside the little walking stage, the guard can acknowledge you again when you hold him up.

After having held up the guard, turn to the side and shoot the wall, then hop in front of the guard.
Use first person aim to stop in the air, aim with your M9 at the guards head so he drops the dogtag.
Shoot the guard and hop until you grabbed the dogtag, then leave through the door to return back to normal.

With FULL health, hang over the ledge and climb all the way to the end. There is no faster way.

You have two options here depending on your game version. Games that run in 16×9 can capture two images of Ray here.
Right side and marine logo. The right side can just be shot at the head of Ray. The marine logo is his left foot.
If playing on a 4×3 resolution version, just take the right side photo and grab the marine logo after getting down at the pipe.

There is a specific angle where on 4×3 resolutions the left leg can work as a Marine logo. But further testing for the reliability is required.

Mainly you can enter first and hold up the guard to get his dogtag, then take the pictures quickly while he shakes off his DT.
Follow the path and glide down the pipe, take the marine logo picture if not already done,
walk south to meet the next guard at the corner that has your second to last dogtag.

Either go left and take the extra pictures, hold up the third guard, or walk down south on the right side to go to Holds 2 first.

On entering the Holds 2 from the right, all guards will watch the right side of the room.
So all you can do is wait at the corner and when the guards turn left, then you can go further down.
The next dogtag is at the projector, or holds 2 projector guard. Hold him up and tranq him.
Walk left past the projector. Either walk out of the room to reset the room or switch the projector.
Finally move up through the room as usual and the last dogtag here is held by the guard at the top left corner.
Once the dogtag was acquired, leave through the top left door as usual.

IF NOT ACQUIRED BEFORE
On returning into Holds 3, you can take the front right and marine logo picture as usual.
The final dogtag is owned by the extra guard to the left of the room. Simply hold him up.
Get his dogtag and then tranq him. Deliver your photos at the PC and finish tanker.

Ideally you finish with the M9 on your previous slot, so you can continue into Plant faster.

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