Garage slab leak in underground garage in home unit block, where the cavity required for the construction crane was subsequently filled in.

What membrane product do you recommend to apply to the perimeter of the below rectangle?

Click on: Slab leak on 12 Oct 2017

Above is a close up of the most obvious narrow aperture

Perhaps the membrane product would have to be wetter than usual to hopefully penetrate sufficiently to block the tiny aperture as cars would drive over it and eventually wear the surface material down to ground level?
I applied two applications of Drizoro (two components that i had to mix together and add water) to a large double garage roof after construction, so I have a little experience at a waterproof membrane