Okinawa Naval Trench Park: Historical Exploration of the Former Naval Headquarters Trench and War Relics

The Former Okinawa Naval Headquarters Fortress, a treasure trove of evidence, chronicles the bloody history of Okinawa during World War II. The wealthy man believes the underground fortress is remarkably well-preserved and a worthwhile place to explore and savor the historical traces.

Traffic in the Former Okinawa Naval Headquarters

You can reach the Former Okinawa Naval Headquarters in the following ways:

  • Self-driving: The rich man drove himself this time and there is free parking.
  • Public Transportation: Get off at the monorail "Obuyama Park" station and take a taxi.

Okinawa Former Naval Headquarters Admission Ticket

The wealthy family purchased their tickets on-site, with adult tickets costing 600 yen and children 300 yen. The crowds were small that day, and the wealthy family only encountered a few children.

Okinawa Former Naval Headquarters Trench – Former Naval Headquarters Trench Ticket

Introduction to the Former Okinawa Naval Headquarters

The Former Naval Headquarters Trench, located within Naval Trench Park, is a significant historical relic of the Battle of Okinawa during World War II. In 1944, the Japanese Navy dug a 30-meter-deep and approximately 450-meter-long underground trench in the hilly terrain of Tomigusuku Castle as a base for protracted warfare, reportedly capable of accommodating 4,000 soldiers.

Photo of the entrance to the former Okinawa Naval Headquarters trench.

沖繩舊海軍司令部壕 - 紀念館建築物
Okinawa Former Naval Headquarters Moat – Memorial Building

After entering the memorial building, you can see some old photos of Okinawa residents and Japanese soldiers' internment camps during World War II.

沖繩舊海軍司令部壕 - 二戰舊照片
Okinawa Old Naval Headquarters Trench – Old WWII Photo

Battle of Okinawa Exhibition Hall

Take the elevator to the underground floor, where you will find a document exhibition hall at the entrance. The hall houses weapons, uniforms, and daily necessities of the Japanese army at the time, allowing visitors to gain a deeper understanding of the history of the Battle of Okinawa in World War II.

On January 20, 1945, Vice Admiral Ota Minoru was appointed commander of the area. However, not long after, in March, the US military launched its offensive, marking the beginning of the 87-day Battle of Okinawa. By mid-May, with the US military advancing into Naha, the Japanese Army stationed near Shuri decided to retreat to the southern tip of Okinawa Island and plan a joint counterattack with the Japanese Navy, which was defending the Oroku Headquarters Ditch. However, due to a miscommunication, the rendezvous was not possible. By June, the US offensive intensified, forcing the rendezvous to be abandoned, leaving the Japanese Navy stranded near the Headquarters Ditch helpless and vulnerable.

The exhibition hall preserves the last telegram sent by Commander Ota Minoru before his death. This reminds the rich man of his visit to Tokyo.Japanese War MuseumThe scene at the Hall of Heroes is very heavy and solemn.

沖繩舊海軍司令部壕 - 大田實海軍中將
Former Okinawa Naval Headquarters Trench – Vice Admiral Ota Minoru

Listen to the full wartime telegrams online (Japanese and English versions).

沖繩舊海軍司令部壕 - 戰時電報
Former Okinawa Naval Headquarters Trench – Wartime Telegram

On June 4th, the US military launched a fierce offensive, encircling the southwest of Naha. On the evening of the 6th, Commander Ōta issued a farewell telegram, expressing his resignation. On the morning of the 13th, Commander Ōta Sane and several other officers committed suicide in a trench. With Commander Ōta's suicide, organized fighting in the Oroku area ended.

沖繩舊海軍司令部壕 - 沖繩島戰役美軍進攻路線
Former Okinawa Naval Headquarters Trench – US Army offensive route during the Battle of Okinawa

The soldiers' uniforms and weapons during the war.

沖繩舊海軍司令部壕 - 沖繩日軍裝備
Former Okinawa Naval Headquarters Trench – Okinawa Japanese Military Equipment

Historical commentary on the Battle of Okinawa.

沖繩舊海軍司令部壕 - 沖繩島戰役歷史解說
Former Okinawa Naval Headquarters – Historical Explanation of the Battle of Okinawa

Some statistics of the Battle of Okinawa show that Okinawa also suffered great damage during World War II.

Statistics

  • Unexploded ordnance disposal in Okinawa Prefecture – 1,178,869 rounds
  • Remains found in naval trenches – 1,090
  • Number of bombs used by the US military – 2,716,691
  • Total deaths (including Japanese soldiers, American soldiers, Okinawans, and migrant workers) – 200,656
沖繩舊海軍司令部壕 - 沖繩島戰役統計數字
Former Okinawa Naval Headquarters Ditch – Okinawa Battle Statistics

Items left behind by soldiers in the trenches of the former Naval Headquarters in Okinawa.

沖繩舊海軍司令部壕 - 沖繩島戰役士兵遺留物品
Former Okinawa Naval Headquarters Ditch – Remains of Soldiers from the Battle of Okinawa

Knitting to pray for the victims.

沖繩舊海軍司令部壕 - 祈福編織1
Okinawa Former Naval Headquarters Trench – Prayer Knitting 1
沖繩舊海軍司令部壕 - 祈福編織2
Okinawa Former Naval Headquarters Trench – Prayer Knitting 2

After visiting the memorial hall, we prepared to enter the old naval headquarters trench. The entrance was also covered with prayer ornaments and a small altar for the Bodhisattva.

沖繩舊海軍司令部壕 - 沖繩舊海軍司令部壕入口
Okinawa Former Naval Headquarters Ditch – Entrance to Okinawa Former Naval Headquarters Ditch

After passing the small altar, we prepared to go into the trench, which involved about 100 steps. If you are traveling with elderly people, you should consider their leg strength.

沖繩舊海軍司令部壕 - 壕內地下樓梯
Former Okinawa Naval Headquarters Trench – Underground Stairs in the Trench

An underground map of the old Naval Headquarters. The wealthy man believes the old Naval Headquarters is remarkably well-preserved, with the wartime signal room, medical room, operations room, and commander's office all intact.

沖繩舊海軍司令部壕 - 壕內地圖
Former Okinawa Naval Headquarters Trench – Trench Map

Soldiers worked day and night, using small shovels to dig out a 400-meter underground bunker.

沖繩舊海軍司令部壕 - 挖壕工具
Former Okinawa Naval Headquarters Trench – Digging Tools

The signal room, where telegraphs were sent. A Type 92 wartime telegraph machine remains on site.

沖繩舊海軍司令部壕 - 信號室
Okinawa Former Naval Headquarters Trench – Signal Room

A photo of the walkway in the former Naval Headquarters trench. The walkway is about 180 centimeters high, so even a wealthy person can easily walk through it. However, taller people will have to bend their heads to walk.

沖繩舊海軍司令部壕 - 壕內走道
Former Okinawa Naval Headquarters Trench – Walkway inside the trench

This telegram, sent at 12:36 PM on June 6, 1945, describes the Okinawans fighting alongside the Japanese army. Despite a shortage of supplies, the people actively participated in the battle, with even women and children caught up in the flames of war, showcasing their fighting spirit and tragic emotions.

沖繩舊海軍司令部壕 - 沖繩人民的戰鬥精神
Former Okinawa Naval Headquarters – The Fighting Spirit of the Okinawa People

Medical room.

沖繩舊海軍司令部壕 - 醫療室
Okinawa Former Naval Headquarters Trench – Medical Room

The non-commissioned officers' room is where soldiers usually rest. The space is very small and there is no place to put beds. There are only simple shelves for soldiers to lean on and rest. Even sleeping can only be done standing up.

沖繩舊海軍司令部壕 - 士官兵員室
Former Okinawa Naval Headquarters – Officers' and Soldiers' Room

The most tense attack exit in the trench.

沖繩舊海軍司令部壕 - 壕內攻擊出口
Former Okinawa Naval Headquarters Trench – Attack Exit in the Trench

Commander's Office. Commander Ota Minoru led several generals in a mass suicide in a trench with grenades. Traces of grenade fragments remain on the walls.

沖繩舊海軍司令部壕 - 司令官室1
Former Okinawa Naval Headquarters – Commander's Room 1
沖繩舊海軍司令部壕 - 司令官室2
Former Okinawa Naval Headquarters – Commander's Room 2

After Japan's defeat, many soldiers committed suicide. These images, captured in vivid detail, left a heavy heart upon viewing them. Alas, the scars of war can be seen everywhere in the old naval headquarters trenches, a heartbreaking sight.

沖繩舊海軍司令部壕 - 壕內士兵自殺
Former Okinawa Naval Headquarters Trench – Soldier commits suicide in the trench

The rich man found the atmosphere inside the old naval headquarters trench a bit eerie, considering it was once a battlefield. If you're bothered by this kind of atmosphere, he suggests reconsidering your decision. Whew! Finally, I saw light from the cave entrance! The exit was right in front of me, and the next step was a gentle slope, no more stairs to climb.

沖繩舊海軍司令部壕 - 壕內出口坡道
Former Okinawa Naval Headquarters Trench – Exit ramp inside the trench

Not far from the exit, there is a tomb where the people of Okinawa can pay tribute to the officers and soldiers who bravely sacrificed their lives in the trenches.

沖繩舊海軍司令部壕 - 壕內出口
Former Okinawa Naval Headquarters Moat – Moat Exit

In March 1953, archaeologists discovered the remains of over 800 people, including Commander Ota, in the former Navy Headquarters trench. In 1958, they discovered the remains of over 1,500 more. The Okinawa Sea Friends Association then built a memorial tower for the Navy's fallen soldiers to commemorate the souls of those who heroically sacrificed their lives. In March 1970, a 300-meter section of the trench was restored and opened to the public.

沖繩舊海軍司令部壕 - 海軍戰歿者慰靈之塔
Former Okinawa Naval Headquarters Trench – Memorial Tower for the Navy's War Dead

rich man experience

After visiting the Old Naval Headquarters Trench, the rich man felt a little complicated. This should be the saddest war attraction he has ever visited, but he still wants to share it with all his friends.

Attractions nearby

New Naval Trench Park! A large, banyan-themed playground, the Banyan Tree Maze, will be constructed. The existing, dilapidated playground equipment will be demolished and replaced. Taking advantage of the slope, a 35-meter-long slide will be installed. Construction is expected to be completed in March 2026. Stay tuned!

沖繩舊海軍司令部壕 - 海軍壕公園
Okinawa Former Naval Headquarters Trench – Naval Trench Park

Visit Information

Address: 236 Toyomi Castle, Toyomi City, Okinawa Prefecture, 901-0241

Opening hours: 09:00 ~ 17:00

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