Caves are mysterious areas which depict the lifestyle of ancient times through paintings and carvings on the walls. These ...

A team of experts from Kim Il Sung University, Kim Chaek University of Technology, the National Authority for the Protection ...

In other caverns, the concrete filling the pillars has spilled out to coat the limestone ground. Water showed traces of iron pollution by rust coming from the metal.

AKTUN TUYUL CAVE SYSTEM, Mexico (AP) — Rays of sunlight slice through pools of crystal water as clusters of fish cast shadows on the limestone below. Arching over the emerald basin are walls of ...

AKTUN TUYUL CAVE SYSTEM, ... The caverns rumble as government workers use massive metal drills that bore into limestone, embedding an estimated 15,000 steel pillars into the caverns.

Engineer Guillermo D. Christy photographs a steel pillar filled with concrete that was installed inside the Aktun Tuyul cave system to support the Maya Train track on the outskirts of Playa del ...

Aktun Tuyul Cave System, MEXICO — Rays of sunlight slice through pools of crystal water as clusters of fish cast shadows on the limestone below. Arching over the emerald basin are walls of ...

AKTUN TUYUL CAVE SYSTEM, Mexico (AP) — Rays of sunlight slice through pools of crystal water as clusters of fish cast shadows on the limestone below. Arching over the emerald basin are walls of ...

Engineer Guillermo D. Christy collects water samples while sitting next to a steel pillar filled with concrete, installed to support a part of the Maya Train track, inside the Aktun Tuyul cave ...