The entire building is under considerable pressure due to the large load of the trees and it is a miracle that after hundreds of years, the chapel survives with no damage to the structure or to the trees. A spring comes out from underneath the chapel and irrigates the trees." (excerpted from: http://orthodoxwiki.org/Theodora_of_Vasta; for the geophysical report cited, see: http://www.archaeometry.gr/oldv/symposium2003/pages_en/abstracts/papers/geophysical/geo8.htm)
Απολυτίκιο Της Αγίας Θεοδώρας (Βάστας) Ηχος δ΄.Ταχύ προκατάλαβε.
Apolytikion of St. Theodora of Vasta in the Fourth Tone.
As a most-precious gift, and rational offering, was proved to be, to Christ the God over all, your blood O all-pure one. Therefore Righteous Martyr, Theodora entreat for the remission of sins, salvation of souls, grant to those who honor your divine struggles.
(amateur translation of the above hymn, taken from: http://orthodox-answers.blogspot.com/2007/08/blog-post_23.html)
Through the prayers of our Holy Fathers, Lord Jesus Christ our God, have mercy on us and save us! Amen!