Another underground connection at the south portal

Future connections between the SR 99 tunnel and city streets are continuing to take shape at the south portal, even if they're only partially visible from the surface. Drivers passing overhead didn't know it, but Seattle Tunnel Partners recently demolished a temporary wall separating the future mainline section of the tunnel from the on-ramp that will one day allow travelers to access northbound SR 99 from the stadiums.

The first photo shows the view from inside the cut-and-cover section of the tunnel. The half-demolished wall on the left offers a glimpse of the future tunnel on-ramp. The second photo shows the same area from the south side of the wall.

Ramp breakthrough     Northbound on-ramp
 
This work is occurring underneath the temporary section of southbound SR 99, to the west of CenturyLink Field. As you can see below, the footprint of the ramp and the mainline are continuing to take shape.
 
Future 99 configuration
 
As this post explains, a similar breakthrough occurred in February. STP will continue building the future connections at both tunnel portals as they work to resume mining.