On December 18, 1972, the first sirens to alert US B52 aircraft to Hanoi bombs were sent from the tunnel at the foot of Thang Long citadel.
Thang Long - Hanoi Heritage Conservation Center is open to visitors to visit the T1 combat command tower for the 45th anniversary of the "Dien Bien Phu aerial" event in Hanoi (18-29 December, 1972).
Taking orders directly from the headquarters of the Party Central Committee, the cadres in T1 cellars processed information, helping the General Staff and the Military Committee receive reports and direct war on all fronts. In 1972, T1 tunnel at the same time as three tasks is commander shot down US aircraft, ensuring transportation to the South and the organization of the air defense. During the 12 days and nights of the end of 1972, the first sirens to alert US aircraft to attack Hanoi were sent from here. All residents are notified in the shelter before 35 minutes. The armed units are ready to fight.
From the entrance to the east, walk through the tunnel exit into the tunnel. The 64-square-meter chambers are divided into three sections: warfare briefing, combat chambers, and engine room equipment.
Two-layer steel tunnel, resistant to atomic pressure, radioactive gases, toxic gas. In the range of air conditioning system by steam and ventilation, poison filter, anti-jamming.
The headquarters of the war effort is 20m2, the nearest to the eastern tunnel is the workplace of the head of the department - who is responsible for synthesizing the latest situation of the ministry, receiving orders and reporting to superior.
The tunnel was built in late 1964, from the beginning of American escalation to the first North. Boulder molded from monolithic reinforced concrete, the roof jutting out of the ground 1.5 m thick and divided into three layers, middle layer sand pour half a meter against the power of block bombs, air-to-ground missiles, bombs atomic, chemical weapons and germs.
The 34 m2 war room is the 24-hour workplace of the combat crew of the Operations Department, the General Staff Department. This unit has the task of monitoring the situation of the North on land, sea, air and battles in Indochina (B - South, C - Laos and K - Cambodia) areas; To propose to the General Staff the operational plans; Summarize the situation each day, every week to report to the Secretary of Defense and the Chief of General Staff at the morning briefings. At the same time, secretly passing orders of the Ministry to the concerned agencies and units.
This is also the place where anti-aircraft fire alarms for Hanoi, so that people can reach the shelter in time; To report on the development of hostilities for the Party and State leaders; combat results of the army; damage the enemy in the North.
There are more than 20 phones in four rooms. Unit 1 is connected to the Air Defense Corps. Box 2 contacted the Politburo, the Ministry of Transport. Box 3 is linked online with the Ministry of Defense, the General Staff Department, the General Department, the military zone, the military unit. Box 4 contact the A9 Post Office, located in Hung Vuong street.
On the wall to the right of the war room is a map of hand-drawn maps of various sizes: map of the US air force base, navy and force, American allies in Asia-Pacific. December 1972; map layout of the militia of the militia; map of the Northern Air Defense Force.
Next to the maps was a boarding pass posted on December 18, 1972 - the day of the launch of the US Linebacker 2 campaign. The campaign lasts 12 days with the aim of destroying B52 bombing planes in Hanoi, Hai Phong and northern provinces. US President Nixon then decided to put the A52 trump card on the table, aiming for strength, forcing the Democratic Republic of Vietnam to accept US conditions at the Paris Conference.
Brigadier General Nguyen Van Ninh, former Missile Support Officer, General Staff Department recalled the tense moment under the T1 tunnel for 12 days for the visitors.
General Ninh said, on December 18, 1972, deputy chief of staff Phung The Tai told him to "stay here and live." Le Duc Tho from Paris on. B52 to hit Hanoi. General Department 2 (Intelligence Bureau) then confirmed that B52 will hit the evening.
Mr. Tai showed Mr. Ninh some things to do. Before the B52 bombed Hanoi about 40 minutes, Mr. Ninh directly reported the situation with General Vo Nguyen Giap. The general ordered him to report immediately to the Air Defense Corps, the military zone and the anti-air defense throughout the city.
A siren in the corner of the combat room. When the red button is pressed, the whistle is immediately connected to the siren on the roof of the Ba Dinh Hall (today's Parliament House). At that time, 15 anti-aircraft sirens all over the city of Hanoi will be located at the Opera House, the post office, etc., and they will be rescued, urging people to shelter.
On December 18, 1972, the first tornado was broadcast in the T1 tunnel, alerting the city's air defense before B52 bombers arrived.
In the corridor, there are three telephones. Phone number 1 used to hear, responded when President Ho Chi Minh call down, the helicopter in T1 tunnel can not dial out. Phone number 2, number 3
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