Huge shipbuilding yards complete with dry docks

Carthage (/ˈkɑːrθədʒ/; Punic: 𐤒𐤓𐤕𐤟𐤇𐤃𐤔𐤕, romanized: Qart-ḥadašt, lit. 'New City'; Latin: Carthāgō)[3] was an ancientPhoenician city-state located in present-day Tunisia. Founded around 814 BC as a colony of Tyre, within centuries it grew to become the center of the Carthaginian Empire, a major commercial and maritime power that dominated the western Mediterranean until the mid third century BC.[4][5][6]
After gaining independence in the mid seventh century BC, Carthage gradually expanded its political hegemony across northwest Africa, Iberia, and the major islands of the western Mediterranean. Its sphere of influence encompassed an informal empire of colonies, client states, and allies. Despite its cosmopolitan character, the core aspects of Carthaginian culture, language, religion, and identity remained Phoenician, also known as Punic.
At its height in the third century BC, Carthage was the dominant economic, political, and military power in the Mediterranean. It was among the largest and richest cities in the ancient world, and served as the region's leading commercial and industrial hub. Carthage's vast trade network extended from the Levant to West Africa, and from sub-Saharan Africa to northern Europe, providing an array of agricultural goods, precious metals, and manufactured products. This mercantile empire was secured by a large and powerful navy, which for centuries was unmatched in size and strength.

Yes, it was all abut iron tools and shipbuilding. This was a massive trading port.