A picture shows Alpensia Ski Jumping Centre, a venue of the PyeongChang 2018 Olympics, preparing for the match in Pyeongchang, South Korea on Dec.28, 2017.( The Yomiuri Shimbun via AP Images )

A picture shows Alpensia Ski Jumping Centre, a venue of the PyeongChang 2018 Olympics, preparing for the match in Pyeongchang, South Korea on Dec.28, 2017.( The Yomiuri Shimbun via AP Images )

South Korean Air force Black Eagles fly over Alpensia Ski Jumping Centre, a venue of the PyeongChang 2018 Olympics, in Pyeongchang, South Korea on Dec.28, 2017.( The Yomiuri Shimbun via AP Images )

This picture taken on December 28, 2017 in Pyeongchang shows the Alpensia Ski Jumping Centre, a venue for the 2018 Pyeongchang Winter Olympics. Thousands of avid speed skating fans will pack the futuristic Gangneung Oval for the Olympic tournament next month. But afterwards one suggestion is for the cavernous steel-grey structure to host frozen fish. / AFP PHOTO / Yelim LEE

This picture taken on December 28, 2017 in Pyeongchang shows the Alpensia Ski Jumping Centre, a venue for the 2018 Pyeongchang Winter Olympics. Thousands of avid speed skating fans will pack the futuristic Gangneung Oval for the Olympic tournament next month. But afterwards one suggestion is for the cavernous steel-grey structure to host frozen fish. / AFP PHOTO / Yelim LEE

This picture taken on December 28, 2017 in Pyeongchang shows the Alpensia Ski Jumping Centre (L), Alpensia Cross-Country Skiing Centre (C) and Alpensia Biathlon Centre (R), venues for the 2018 Pyeongchang Winter Olympics. Thousands of avid speed skating fans will pack the futuristic Gangneung Oval for the Olympic tournament next month. But afterwards one suggestion is for the cavernous steel-grey structure to host frozen fish. / AFP PHOTO / Yelim LEE

A Nordic ski jumping hill for the 2018 Winter Olympics is capped with snow in Pyeongchang, South Korea, on Nov. 4, 2017. (Kyodo) ==Kyodo

A Nordic ski jumping hill for the 2018 Winter Olympics is capped with snow in Pyeongchang, South Korea, on Nov. 4, 2017. (Kyodo) ==Kyodo

Alpensia Ski Jumping Centre, Oct 30, 2017 : Alpensia Ski Jumping Centre in Alpensia Olympic Park of the 2018 PyeongChang Winter Olympics is seen in PyeongChang, east of Seoul, South Korea. The 23rd Winter Olympics will be held for 17 days from February 9 - 25, 2018. The opening and closing ceremonies and most snow sports will take place in PyeongChang county. Jeongseon county will host Alpine speed events and ice sports will be held in the coast city of Gangneung. (Photo by Lee Jae-Won/AFLO) (SOUTH KOREA)

Photo taken Oct. 30, 2017 shows Alpensia Ski Jumping Centre in Pyeongchang, South Korea. The facility will be used for ski jumping, Nordic combined and snowboarding in the Winter Games in February 2018. (Kyodo) ==Kyodo

(171030) -- PYEONGCHANG, Oct. 30, 2017 -- Photo taken on Oct. 30, 2017 shows the Alpensia Ski jumping Skispringen Ski nordisch Center for the PyeongChang Winter Olympic Games Olympische Spiele Olympia OS 2018, in Pyeongchang, South Korea. ) (SP)SOUTH KOREA-PYEONGCHANG OLYMPIC STADIUM-PROGRESS GengxXuepeng PUBLICATIONxNOTxINxCHN

Alpensia Ski Jumping Centre, Oct 30, 2017 : Alpensia Ski Jumping Centre in Alpensia Olympic Park of the 2018 PyeongChang Winter Olympics is seen in PyeongChang, east of Seoul, South Korea. The 23rd Winter Olympics will be held for 17 days from February 9 - 25, 2018. The opening and closing ceremonies and most snow sports will take place in PyeongChang county. Jeongseon county will host Alpine speed events and ice sports will be held in the coast city of Gangneung. (Photo by Lee Jae-Won/AFLO) (SOUTH KOREA)

Alpensia Ski Jumping Centre, Oct 30, 2017 : Alpensia Ski Jumping Centre in Alpensia Olympic Park of the 2018 PyeongChang Winter Olympics is seen in PyeongChang, east of Seoul, South Korea. The 23rd Winter Olympics will be held for 17 days from February 9 - 25, 2018. The opening and closing ceremonies and most snow sports will take place in PyeongChang county. Jeongseon county will host Alpine speed events and ice sports will be held in the coast city of Gangneung. (Photo by Lee Jae-Won/AFLO) (SOUTH KOREA)

Alpensia Ski Jumping Centre, Oct 30, 2017 : Alpensia Ski Jumping Centre in Alpensia Olympic Park of the 2018 PyeongChang Winter Olympics is seen in PyeongChang, east of Seoul, South Korea. The 23rd Winter Olympics will be held for 17 days from February 9 - 25, 2018. The opening and closing ceremonies and most snow sports will take place in PyeongChang county. Jeongseon county will host Alpine speed events and ice sports will be held in the coast city of Gangneung. (Photo by Lee Jae-Won/AFLO) (SOUTH KOREA)

Alpensia Ski Jumping Centre, Oct 30, 2017 : Alpensia Ski Jumping Centre in Alpensia Olympic Park of the 2018 PyeongChang Winter Olympics is seen in PyeongChang, east of Seoul, South Korea. The 23rd Winter Olympics will be held for 17 days from February 9 - 25, 2018. The opening and closing ceremonies and most snow sports will take place in PyeongChang county. Jeongseon county will host Alpine speed events and ice sports will be held in the coast city of Gangneung. (Photo by Lee Jae-Won/AFLO) (SOUTH KOREA)

Alpensia Ski Jumping Centre, Oct 30, 2017 : Alpensia Ski Jumping Centre in Alpensia Olympic Park of the 2018 PyeongChang Winter Olympics is seen in PyeongChang, east of Seoul, South Korea. The 23rd Winter Olympics will be held for 17 days from February 9 - 25, 2018. The opening and closing ceremonies and most snow sports will take place in PyeongChang county. Jeongseon county will host Alpine speed events and ice sports will be held in the coast city of Gangneung. (Photo by Lee Jae-Won/AFLO) (SOUTH KOREA)

Alpensia Ski Jumping Centre, Oct 30, 2017 : Alpensia Ski Jumping Centre in Alpensia Olympic Park of the 2018 PyeongChang Winter Olympics is seen in PyeongChang, east of Seoul, South Korea. The 23rd Winter Olympics will be held for 17 days from February 9 - 25, 2018. The opening and closing ceremonies and most snow sports will take place in PyeongChang county. Jeongseon county will host Alpine speed events and ice sports will be held in the coast city of Gangneung. (Photo by Lee Jae-Won/AFLO) (SOUTH KOREA)

Alpensia Ski Jumping Centre, Oct 30, 2017 : Alpensia Ski Jumping Centre in Alpensia Olympic Park of the 2018 PyeongChang Winter Olympics is seen in PyeongChang, east of Seoul, South Korea. The 23rd Winter Olympics will be held for 17 days from February 9 - 25, 2018. The opening and closing ceremonies and most snow sports will take place in PyeongChang county. Jeongseon county will host Alpine speed events and ice sports will be held in the coast city of Gangneung. (Photo by Lee Jae-Won/AFLO) (SOUTH KOREA)

Alpensia Ski Jumping Centre, Oct 30, 2017 : Alpensia Ski Jumping Centre in Alpensia Olympic Park of the 2018 PyeongChang Winter Olympics is seen in PyeongChang, east of Seoul, South Korea. The 23rd Winter Olympics will be held for 17 days from February 9 - 25, 2018. The opening and closing ceremonies and most snow sports will take place in PyeongChang county. Jeongseon county will host Alpine speed events and ice sports will be held in the coast city of Gangneung. (Photo by Lee Jae-Won/AFLO) (SOUTH KOREA)

Alpensia Ski Jumping Centre, Oct 30, 2017 : Alpensia Ski Jumping Centre in Alpensia Olympic Park of the 2018 PyeongChang Winter Olympics is seen in PyeongChang, east of Seoul, South Korea. The 23rd Winter Olympics will be held for 17 days from February 9 - 25, 2018. The opening and closing ceremonies and most snow sports will take place in PyeongChang county. Jeongseon county will host Alpine speed events and ice sports will be held in the coast city of Gangneung. (Photo by Lee Jae-Won/AFLO) (SOUTH KOREA)