More craters have popped up in northern Russia causing reason for concern.

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On Monday, The Siberian Times published their interview with Moscow scientist Vasily Bogoyavlensky, in which he explained the situation.

At the end of last summer, one massive crater appeared in Siberia's Yamal Peninsula and then two others popped up as well.

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Now, major concern has stricken many in that region especially Bogoyavlensky since mini craters have been discovered by Russian experts who have been studying the first three craters that appeared last year.

Bogoyavlensky is the deputy director of the Moscow-based Oil and Gas Research Institute, part of the Russian Academy of Sciences and revealed to The Siberian Times, "We know now of seven craters in the Arctic area. Five are directly on the Yamal Peninsula, one in Yamal Autonomous district, and one is on the north of the Krasnoyarsk region, near the Taimyr peninsula.

"We have exact locations for only four of them. The other three were spotted by reindeer herders. But I am sure that there are more craters on Yamal, we just need to search for them," he said, adding, "I would compare this with mushrooms: when you find one mushroom, be sure there are few more around. I suppose there could be 20 to 30 craters more."

The scientist is adamant about studying these new craters via a new expedition.

"These objects need to be studied, but it is rather dangerous for the researchers. We know that there can occur a series of gas emissions over an extended period of time, but we do not know exactly when they might happen," he shared.

One of the most interesting discoveries is the crater called B2.

"[L]ocated 10 kilometers to the south of Bovanenkovo. On the satellite image you can see that it is one big lake surrounded by more than 20 small craters filled with water. Studying the satellite images we found out that initially there were no craters nor a lake. Some craters appeared, then more. Then, I suppose that the craters filled with water and turned to several lakes, then merged into one large lake, 50 by 100 meters in diameter," Bogoyavlensky explained.

"This big lake is surrounded by the network of more than 20 baby craters now filled with water and I suppose that new ones could appear last summer or even now. We're now counting them and making a catalogue. Some of them are very small, no more than 2 meters in diameter," he added.