at the same time that the underwater crossing of line 7 was completed, line 10's tunnel from "maubert" to "jussieu" was also completed. the route crossed intersection in the direction of monge by a flying junction. on 21 april 1931, the underwater tunnel of line 7 was completed up to the station of "jussieu". the completion of this station necessitated a considerable amount of work with regards to its location under the halle-aux-vins, upon which the faculté des sciences de jussieu is located. here, the tracks are supported by concrete on both sides, and those of lines 7 and 10 lie side-by-side.