Systematic archaeological excavations in the Velić village, near Trilj, began in 2013. By 2019 we revealed the remains of a rectangular ground plan building with a semicircular apse. It consists of the antechamber and three chambers: central chamber with an apse, south chamber, and north chamber with an east-west oriented barrel-vaulted tomb (Tomb 1), which was unfortunately quite devastated. In addition to this devastation, excavation campaigns have been characterized by the extreme poverty of small finds, which prevents accurate dating of the site. Nevertheless, the building can be roughly dated to the period of Late Antiquity and interpreted as an Early Christian memorial chapel. This assumption was reinforced in the 2019 excavation campaign when another barrel-vaulted tomb (Tomb 2) was detected below the central chamber with an apse. This time it was sealed and intact. It had a small square antechamber with a vertical stone slab serving as a door to the tomb. Its barrel-vaulted ceiling was completely preserved, and skeletal remains of four individuals were identified laying down on two flat stone plastered beds in the grave chamber. Although the tomb and its state of preservation were astonishing, the archaeological excavation faced a daunting task of documenting the buried structure and its content. Since image-based modeling has been used as a practical and detailed documentation tool on the site so far, it was only natural to approach this part of the excavation in the same manner. This paper will present difficulties and solutions that we came across during the documentation process of this barrel-vaulted tomb as well as some conclusions and interpretations of the tomb and the larger complex around it.