At first glance， these photographs seem to show a scuba[水下呼吸器] diver[潛水者] exploring the depths of an underwater world. But if you look more carefully you will see a tree， a bridge and even a park bench.

In fact these incredible[難以置信的] images show a diver crossing an Austrian lake that floods every year， covering everything in the surrounding area.

Set among the snowy Hochschwab Mountains， the Green Lake in Tragoess， Austria， is normally only one metre deep.

For most of the year， visitors to the scenic[景色優(yōu)美的] spot can stroll[閑逛] around the beautiful lake， enjoying the stunning[極好的] landscape from one of the benches set near the waters edge. They can wander[漫步] down several footpaths[人行道] and cross one of many small bridges. But every year from mid-May to June， when the snow melts， the lake floods and submerges[浸沒] everything surrounding it.

Around 12 metres of water covers trees， footpaths， benches and bridges. Gallons of clear， 7°C water doubles its size from 2，000sq metres to over 4，000sq metres.

Diver Marc Henauer， from Perly， Switzerland， heard about the natural event and came to explore the lake for himself.

The 39-year-old said， “When I was underwater， it felt like I was swimming in a magical world， it was so beautiful. Swimming over the green grass， flowers， paths， rocks and trees was like being in a fairy tale.

“We were lucky that the sun created fantastic[極妙的] light rays through the water. My wife and I stayed there for seven days and we did three dives every day， spending one hour on each dive.”

He added， “We only had a very short time to take images when the sun was in a perfect position. Diving is possible only for a month in the spring. Throughout the year the depth of the lake is too low. The visibility[可見度] is just incredible. Usually you only see water like this in tropical[熱帶的] seas.”

乍看之下，這些照片似乎展示了一名潛水者正在探索海底世界。但仔細觀察的話，你會看到圖中不僅有樹，有橋，甚至還有公園的長椅。

事實上，這些神奇的照片展示的是一名潛水者在一個奧地利的湖泊里潛游的情景。每年，這個湖的湖水都會暴漲，把周圍的一切完全淹沒在水中。

翠湖位于奧地利特拉古斯白雪皚皚的上施瓦布山當中，平時水深只有一米多。

一年中的大部分時間，來到該景區(qū)的游客都可以在美麗的湖邊漫步，坐在湖邊的長椅上欣賞令人嘆為觀止的美景，也可以沿著數條小徑漫步，穿過多座小橋。但在每年5月中旬至6月期間，山上的冰雪消融，湖水便會暴漲，淹沒周圍的一切。

約12米深的湖水會把樹木、人行道、長椅和小橋統(tǒng)統(tǒng)淹沒。大量水溫為7攝氏度的清澈融水將湖面從2千平方米擴大到4千平方米，擴大了整整一倍。

來自瑞士佩爾利的潛水者馬克·赫諾爾聽說了這一自然現象，特地前來一探究竟。

39歲的馬克·赫諾爾說：“在水里我感覺就像在一個奇幻世界里游泳，它是如此美麗。從青草、鮮花、小徑、巖石和樹林上方游過，就像在童話世界里一樣。

“我們很幸運，陽光穿透湖水，投射出夢幻般的光線。我和妻子在那里待了七天，每天潛水三次，每次潛一個小時?！?/p>

他補充道：“我們要趁太陽處于完美的角度時抓拍照片，所以時間很短。一年四季只有春天里的一個月適于潛水，其他時間湖水都太淺了。湖水的能見度高到難以置信。通常只有在熱帶海域才能看到如此清澈的水?！?/p>