Figure 4.5. Shaded relief bathymetry, colored by water depth, showing the Ted Williams Tunnel as it crosses Boston Inner Harbor from south Boston to Logan Airport (see fig. 4.2 for map location).  The tunnel is marked by a depression about 50 m wide that is a few m deeper than the navigation channel;  on the northern side of the channel, the tunnel depression has a central high and channels about 2-4 m deeper along the western and eastern edges.   Red dots show location of bottom photographs (see Appendix 3 to view all photographs at these locations); yellow dot is location of bottom sediment sample (Appendix 2); number is station identifier.

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