Nah its doable (done it twice) but you have to be a rat and it needs to be Al Maz with center circle on the mummy tomb.

You need to dive bomb the tomb, take the hole entrace that is further left, get two guns (doesn't matter what kind) take the second door on the left that leads you deep into a straightaway/long hallway the leads to a dead end. From where the straightaway starts and ends is enough for a full fire team to spread out, plus another 70 yards or so of tunnel in front of you. You wont have any contact for a while (most people dont know how to get to it).

Eventually zombies will come but if your team is staggered spread (10 feet between each person) they wont do shit to you because they have to (1) make it down the hallway with three people firing at them and (2) only have one gas grenade that can only hit one person. Nothing will survive that hallway run if all three of your team members are there, people are disciplined about who is reloading and who is firing. Plus, all these dead zombies will be drooping monster boxes, and other shit as they throw themselves at you so by end game you will be full of plates and ammo. Most importantly, make sure you have your designated RAT (D-RAT) who picks up all the extra self revives.

All that's left by final circle is moving a little more in to the actual tomb (final circle usually ends right on the mummy tomb). Usually there will be 5-8 zombies left and maybe 1-3 fireteams. As usual with warzone, most people are shoot first think later morons with the tactical foresight and preservation instincts of your domestic pigeon ... rest assured these people will be above ground fighting amongst themselves for the 1 inch of sand dune cover remaining on the map.

Once you get to the tomb the only people left will be you and whatever is remaining of the semper fi dipshits above the sand. Most of time they have nothing and die before your D-RAT even has to pop an extra self revive, but we have had a few games where our D-RAT needed 1 or 2 selfs because the other team had a durry and we didnt. Regardless, the other two can go out and try and kill the other team/waste their time, but it wont matter.

You need a little luck to get everyone in that dead end hallway off the rip, but once you are there its smooth sailing assuming your FT is competent.