(1) the so-called Neapolitan Crypt (photo, right, entrance Naples side). the tunnel that connected the port of Pozzuoli and the adjacent area of the Flegrean Fields with the city of Neapolis;The fact the Cucceius built so many tunnels causes some confusion, and one is likely to hear or read an incorrect reference to the "galleria di Cocceio" (the tunnel of Cucceius). Technically, archaeologists use that term for number 2 on the above list. The others are simply "another of those tunnels by Cucceius"! Also, I was wandering around the recently excavated old city of Pozzuoli. The cathedral of Pozzuoli burned in 1964 and, lo and behold, they found that it had been built over the "Temple of Augustus" (photo, above, left). The temple was built at the behest of a rich merchant, one Lucius Calpurnius, during the age of the August One —and built by Lucius Cucceius Auctus.
(2) the Cucceius Tunnel (photo, below, right) which joined Lake Averno to the road that led from old Arco Felice to the fleet facilities at Baia, the home port for the Western Imperial Fleet and then on to Cuma (photo, below, right). (That tunnel was later also known as the "Gallery of Pace"—not Italian for "peace," but rather after a Spanish captain, Pietro de Pace, who used the tunnel in the early 1500s to plunder the ruins of Cuma);
(3) a tunnel that joined Lake Averno to nearby Lake Lucrino (a passageway now known to scholars as the cave of the pseudo-Sybil; and
(4) the Seiano Grotto (photo, below, left)—all this in addition to the entire Portus Iulius, itself;
(5) It is plausible that Cucceius was also responsible for the "Roman Crypt", the tunnel that passes beneath the Cuma acropolis.