In 2008 work continued on digging up archaeological remains as part of the project to revamp the castle, directed by doctor Joan Albert Adell, and conducted by the company Codex Arqueología y Patrimonio under the guidance of the archaeologist Daniel Alcubierre.
One of the most revealing discoveries in 2007 was an ensemble of defence elements in the eastern courtyard, where a wall and moat were identified, which after the discoveries made in 2008 could be dated back to the Ibero-Roman period and the middle ages. In 2008 the abertis foundation wanted to heighten its knowledge of these elements and to lend them value within the monumental ensemble of Castellet.
As a result, remains have been discovered which make it easier to understand how the castle evolved since it was first erected and up to the present. They reflect the historical events which also took place at the same time. Thanks to the new discoveries it is deduced that the castle must have operated as a checkpoint and surveillance post for the main routes existing at the time: the Foix river, Via Heraclia and later Via Augusta.
A defensive moat and almost an entire 14-metre wall have been recovered, the construction of which dates from the Iberian period. The location of this wall, which runs on from the south courtyard structures, made it possible to offer a precise depiction of the floor plan of the Castell de Castellet as it stood in the 10th century. This construction was accompanied by a six-metre wide moat and a defensive countermure. Both structures would have served to protect the eastern face of the castle.
The recovery of these defensive elements from the 10th century may be related to the first record citing the Castell de Castellet, from 977, and to other historical events.
The abertis foundation plans to include this area within its guided tours and to continue to enhance the knowledge about it.