Castellón Harbour is immersed in the construction of an innovative breakwater situated at the incoming channel, near the southern basin. The breakwater, which is being built by FCC in a joint venture, consists of 13 reinforced-concrete caissons, ten of which lie along the main alignment, for a total length of 448.40 metres.

The breakwater will perform a double function: It will provide protection against the heavy storms of the Levante and it will perform a commercial function, since the Port Authority plans to use this new infrastructure for cruise traffic (PortCastelló's latest great thing) and vehicular traffic (Plans are to build two ro-ro slips in a 16-metre-deep zone for that purpose).

The new breakwater has a hundred internal conduits (cells) that enable it to buffer the impact of the waves in emergency situations by expelling water in a system called a "blowhole".

Thus, it has been unnecessary to build a sloping wall with riprap or concrete blocks, "which would have been much less environmentally friendly", explained the Castellón Port Authority General Manager Roberto Arzo during a tour of the site. He stressed, "This project makes Castellón Harbour unique, because no other Spanish harbour has got a system like this. At Algeciras Bay there's something similar, but not at the entrance area".

Port Authority President Juan José Monzonís agreed. "You've got to remember, this is a sustainable project environmentally speaking, and in addition it has received numerous distinctions for its commitment to innovation in the harbour system as a whole".