Under the sea part 23.3km
Deepest part 240m
the depth of water 140m,Tunnel passing 100m
under the bottom of sea
Hokkaido Shinkansen start at 26th May 2016
Shin- Aomori and Shin-Hokodatehokuto
1067m/m wide (3ft 6 in)
①and ③ for Shinkansen Train
1435m/m wide(4ft 8 1⁄2 in)
Seikan Tunnel connecting between 「青森」（Aomori）
and 「函館」（Hakodate )
We can read 青 two ways, it's Ao and Sei
We can read 函 two ways, it's Hako and Kan
So, we call this tunnel for 「Sei Kan Tunnel」
3h20m