Despite the tunnel being examined extensively during the 19th century by Robinson, Charles Wilson, and Charles Warren, they all missed discovering the inscription, probably due to the accumulated mineral deposits making it barely noticeable.
Meskipun telah diteliti dengan cermat pada abad ke-19 oleh Robinson, Charles Wilson, dan Charles Warren, mereka tidak melihat tulisan itu, karena tertutup endapan mineral, sehingga sulit terbaca.