A giant drilling machine has been installed at the site in a bid to make a parallel tunnel and excavation started in the afternoon.
Energy, Green Technology, Science, Climate Change and Environment Minister Yeo Bee Yin says she has proposed the idea to the Meteorological Department.
The small Japanese contingent played a humanitarian support role in the drill after US and Filipino marines made an amphibious landing to retake Philippine territory from a "terrorist" group.
It will see Austrian company having stronger business presence in Southeast Asia.
About 3,200 troops from China have joined about 300,000 Russian troops for a week of war games in Siberia and the Far East.
The cancellation was announced by Britain's embassy in Japan and the Ministry of Defence in Tokyo.
South Korea said on Tuesday it has decided to scrap an annual government mobilisation drill this year as part of a suspended joint exercise with the United States but will carry out its own drills to maintain readiness.
China's navy carried out a simulated missile attack in an unspecified area of the South China Sea using three target drones making flyovers of a ship formation at varying heights, the official army newspaper said.
Bystanders watch police drill to prepare for 14th general election.
Curious bystanders watch in awe as Penang police conduct drill ahead of 14th general election.