It was not until 1694 that Kino attempted to build the ship. He was then among the Sobas on the Gulf, and with him were Father Campo and Captain Manje, the latter of whom has left a diary of that journey. He began to cut his timber on March 16, 1694, but he was informed that Lower California was not an island, but a peninsula, and he then inaugurated a series of amazing overland journeys to reach the head of the Gulf. His companion Captain Manje had told him of the wonderful structures on the Gila River and thither he directed his steps. He is said to have celebrated Mass in the largest of those ruined buildings, the famous Casa Grande. It was quadrilateral in form and four stories high. The rafters were of cedar and the walls of solid cement and masonry. It was divided into various compartments, some of them spacious enough for a considerable assembly. The tradition among the people was that Montezuma's predecessors built it on the way from the north to the southern countries where they ultimately settled.
At a distance of three leagues from this Casa and on the other side of the river are the ruins of another edifice, which appears to have been still more sumptuous. Indeed the ruins at that place would indicate that at one time there had been not merely a palace but a whole city, and the natives assured the missionaries that there were other buildings further north which were marvelous for their symmetry and arrangements. Among them was a labyrinth which appears to have been a pleasure house of some great king. Excavators have discovered in various places, sometimes leagues away from these great buildings, shapely and variously colored slabs, and two leagues from the Casa Grande there was found the basin of a reservoir large enough to supply a populous city and to irrigate the fertile plains around for great distances; while to the west was a lagoon which was emptied by a narrow sluice. The regularity of the circular form of this lagoon and its rather contracted dimensions would suggest that it was the work of men were it not for its extraordinary depth. Holes had been cut into the solid rock which subsequently were found large enough to be used as storehouses for provisions for troops.