N. Kósa Judit - Szablyár Péter: Underground Pest - Our Budapest (Budapest, 2002)

The underground river of Pest - the mains trunk sewer underneath the Great Boulevard

With the completion of the mains trunk sewers those discharge holes on the river bank which were not kept as back-up outlets were phased out. Following that, the building of the Danube promenade, that popular esplanade of the citizenry, could be built.

Builders of the millenary subsurface railway and then the metro lines had to proceed with great care at the junctures of the mains trunk sewers (at the And- rássy út-Great Boulevard and the Blaha Lujza tér and Üllői út Great Boulevard crossroads). There were sections at which the trunk sewer had to be "flattened", while elsewhere the railway tunnel had to be redirected.

The mains trunk sewer was built with three-layered brick vaults of superior quality. Its excellence was testified, besides its great age, by two occasions on which major force tubes broke, leaving enormous craters where the road and the tram lines had been. The vaults of the mains trunk sewer remained intact.

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