sentences:  It was predicted that the water would rise 30–40 m in the bottom part of the borehole, but in fact the water rose from the lake to a height of more than 500 m. In October of that same year, the work was suspended for that southern summer because of insufficient funding by the federal Russian government.The drilling project has been opposed by some environmental groups and scientists who have argued that hot-water drilling would have a more limited environmental impact.The main concern is that the lake could become contaminated with the antifreeze that the Russians used to keep the bore hole from refreezing.