Final Survey｜水月湖年縞クルーズ特別編｜Lake Suigetsu Varve Cruise – 7万年の地層発見

Final Survey｜水月湖年縞クルーズ特別編｜Lake Suigetsu Varve Cruise – 7万年の地層発見

Today is a special edition: a sequel to our varve museum video from five uploads ago. Now we’re boarding the Lake Suigetsu cruise—let’s set sail! Our location is the Mikata Five Lakes in Fukui Prefecture, Japan. Lake Mikata is the only freshwater lake of the five, a serene natural sanctuary where reeds and aquatic plants flourish and carp and smelt swim. Lake Suga is a beautiful lake whose slightly salty surface changes color with the seasons. Lake Kugushi is a mix of fresh and seawater connected to Wakasa Bay; its calm surface is famous for rowing competitions. Lake Hiruga is the only saltwater lake among the five, hosting a mystical underwater net-pulling ritual every January. Finally, today’s main stage: Lake Suigetsu. Its bottom is anoxic, preserving 70,000 years of varve layers intact. With some time before the cruise, we visited the Wakasa Jōmon Museum next door to the varve museum. Many areas were off-limits to filming, so please enjoy a glimpse of the overall atmosphere. “It’s so beautiful.”
“It’s a weekday today, so it looks quiet.”
“Yeah, it does.” “Oh!” “Wow, amazing.” “Amazing, look at this tree.” “Hey, can we go in there?” “This is incredible.” “Wow, that surprised me! (laughs)” “Wow. This is amazing—here.” “Incredible.” “These pointed stones were used like axes.” “We bought Fukui plums from the same shop as last time.” “They were perfect for onigiri on our Biwaichi tour and great in lunchboxes during this hot season.” “Huh? These—
My daughter likes sour plums.” “while my son prefers sweet ones.” “All right, thank you.” “But you need to tear them apart a bit first.” “Yes—when we put them in our onigiri, they were so delicious. Ah, thank you.” “Thank you. Yes. Sorry, thank you very much.” “Wow—so beautiful.” “One more minute to go—lakes really are beautiful, aren’t they?” “Here?” “We’ve arrived—here we are!” “I wonder where it is?” “We went to observe the varve boring survey, resumed for the first time in 11 years.” “We heard it’s the final survey, as master driller Mr. Kitamura is retiring.” “Yes! Wow.” “Thank you! That was just now.” “It’s cool. How is it? Let’s eat here.” “Ready… 1, 2—itadakimasu. Mmm.” “Nice—look this way.” “Cheese. Ready… 1, 2—itadakimasu.” “Mmm. Delicious. Really good.” “So beautiful.” “This time, the lead driller is—” “As reported in the news, Lake Suigetsu’s drilling technician is retiring.” “Actually, Mr. Kitamura, Mr. Yamashita, and Mr. Sata work together on deck—” “—they handle the entire boring process, creating the standard measuring stick for dating—” “That’s the drilling tower? (varve tower)” “Lake Suigetsu has a depth of 34 meters.” “I’d like to explain how they drill this hole—so, this…” “There’s a pipe here where the sediment is brought up.” “This time, Mr. Kitamura extended the 1-meter pipe to 2 meters.” “There are 200,000 years of sediment here; the varves remain perfectly continuous—” “Due to scheduling, we couldn’t see the drilling itself, but…” “…we learned that boring is an incredibly delicate and demanding process.” “Thank you very much.” “Thank you.” “Thank you.” “Thank you.” “That felt great.” “Next, we briefly heard from varve research pioneer Mr. Nakagawa.” “Lake Suigetsu’s varves extend over 70,000 years.” “It’s like a grand diary written by Earth itself,” “with spring–summer plankton layers and autumn–winter clay layers alternating,” “recording each seasonal change in vivid detail.” “From the moment the fresh core is pulled up, a split-second battle against oxidation begins.” “In mere seconds, those fragile bands can vanish.” “Mr. Nakagawa works with split-second precision, as if preserving history itself.” “Ohhhh—” “Excuse me, passage please.” “Only here at Lake Suigetsu do 70,000 years of uninterrupted varves remain intact.” “They serve as the global standard ‘measuring stick’ for dating ancient climates and civilizations.” “Do you flatten it like this? This?” “They keep wrapping it so it doesn’t dry out, right?” “This is the varve from earlier?” “Yes, the one you rushed to carry.” “You were rushing with it earlier, weren’t you?” “One layer at a time, Earth’s memories build up. Please etch this miracle into your heart.”

こちらの動画からご覧ください

５つ前の年縞博物館動画の続編です（概要欄リンク）

水月湖クルーズで伝説の掘削やぐらを間近に見学

北村さん最後の７万年年縞ボーリング調査の舞台裏を解説

年縞の前に縄文博物館に立ち寄り、古代土器を少し見学

福井・若狭で家族と楽しむ科学旅
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福井県若狭町観光船レイククルーズ
https://www.wakasa-lakecruise.com/

福井県年縞博物館
https://varve-museum.pref.fukui.lg.jp/

若狭三方縄文博物館
https://www.town.fukui-wakasa.lg.jp/soshiki/wakasamikatajomonhakubutsukan/gyomuannai/533.html

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🎵Music🎵
Bradbury Lane – Don’t Sleep on Your Dreams – Instrumental version
Jay Putty – Be like This – Instrumental Version
Yestalgia – Winter Sleigh Ride
Steven Beddall – Beacon of Hope

chapter
0:00 opening
0:12 map Mikata Five Lakes 三方五湖
1:12 Wakasa Mikata Jomon Museum 若狭三方縄文博物館
3:07 Fukui pickled plums 福井の梅干し
4:04 lake cruise レイククルーズ
8:24 Mr. Nakagawa’s secret story