By Kristiana Hall
These captivating images show a series of stunning ice grottoes.
Taken by Alexander Ippolitov, 37, the photos capture the blues and silvers of the sub-zero caves with their knife-like icicles.
The photos, taken earlier this year, show a network of caves on the shores of a frozen lake near Olkhon Island in Eastern Siberia.
Incredibly, the grottos are formed by sea water freezing following storms, resulting in a unique pattern effect due to the salt.
Alexander, an amateur photographer said: “I love this island, especially in the winter.
“It is so beautiful and it’s a perfect place for photographers.
“When the water freezes there are usually a lot of storms too.
“This results in all the rocky shores being covered by very picturesque ice.”
Alexander trekked to the cave with his wife, who is also captured in a number of the awesome images.
He added: “Depending on the time of the day and light, this ice has different colours which are especially beautiful at sunrise and sunset.
“There are also many so-called ice grottoes.
“Some are so big that you can walk there stood at full height.”