While spending more than three months on a ship, photographer Luke Casey captured images of life at sea from behind the circular window of his cabin. (Photo: Luke Casey)

A trip on a cruise ship orcan be one of the most extravagant and luxurious travel experiences. But there's a less glamorous side to life at sea, which could mean months of isolation, cramped conditions and facing the daily dangers of sea and weather.

In his series titled "Porthole," Hong Kong-based photographer shot photos through the circular window of his cabin on the Japanese ship he spent three months on working as a reporter. The result is a stunning collection of images that capture a unique POV of life at sea -- beautiful, dangerous, and sometimes, lonely.

"I spent a lot of time in my tiny cabin room sat at my desk writing up reports," Casey told Weather.com "I like to shoot on film and had my 35mm camera with me and around 12 rolls of film. I would look out of the little circular window at the many changing views and just began to shoot what I saw day to day. I realized that the the circular porthole is quite unique so instead of cropping it out, I kept it in."

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Casey's ship circumnavigated the globe, traveling from Tokyo, Japan and traveling acrossboth the Atlantic and Pacific oceans, and crossing through both the Suez and Panama canals. "We saw the entire world by boat," he said. "It took us over three months and there were periods where we didn't see land, ship or birds for weeks. Just vast ocean."

The prolonged bouts of unchanging scenery, and the fact that there was no internet or phone reception most of the time, allowed Casey to appreciate his ocean surroundings. "Usually, I would pick up the camera when something a little out of the ordinary would happen outside," he said. "I might wake up and see islands passing the window or a container ship passing by. I would basically wait for the interesting moments to come to me outside the window."

Because life at sea meant dealing with dangerous storms and waves, weather affected Casey's shooting process. "When the real storms hit, the crew would bolt over the porthole closing it with a thick steel door," he said. "That was when it felt really claustrophobic and obviously meant I couldn't shoot what was outside. I also suffered from seasickness at times which effected my motivation to pick up the camera. But most of the time, when the seas were more mild, I would just let the different weather drift by and capture what I could."

View more of Luke Casey's photos on his . An exhibition of his work will open on November 20 at the Time and Space Gallery in Hong Kong, and limited-edition prints will be on sale and available to ship internationally.

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