From Turkey comes news of a documentary film about the tunnels under Hagia Sophia:

Chasing 1,700-year-old secrets hidden beneath Hagia Sophia is no easy feat, but documentary filmmaker Göksel Gülensoy has navigated the labyrinths, ancient and bureaucratic, and will soon release his cinematic chronicle of the subterranean adventure.

Gülensoy’s team of two divers and four spelunkers searched the reservoirs connecting the famous Byzantine building to Topkapı Palace and the Yerebatan Cisterns. The spelunkers tried to find the secret passages said to extend from Tekfur Palace, next to the old city walls, to the islands of the Marmara Sea.