The 1998 summer field season at Susiluola lasted five weeks. The weather was not favourable. It rained almost every day, which slowed down the documentation. The best days saw up to twenty people working in the cavern at one time. Working in the cramped, dark, and wet cavern was difficult and even dangerous.
Rocks fall from the roof.
There is the threat that the roof may cave in after the cavern is emptied. If work in the cavern is to continue, the roof must be supported and the ceiling covered with a net to protect the excavators. It is already clear at this time that no visitors can be allowed in the cavern due to safety considerations. The Susiluola investigations will continue next summer. The working conditions in the cavern were cramped.