Doctor always does the same one thing everytime he boards a cruise ship

A travel expert has urged cruise passengers to do one thing as soon as they board a ship.

“Most passengers have no idea there's a simple five-second check they should perform the moment they enter their cruise cabin,” says travel expert Dr. Steve Burgess, CEO and founder of .

The simple safety measure? Place a clear water bottle on the floor of your cabin as soon as you arrive. “Placing a water bottle on your cabin floor isn't a hydration reminder—it could literally save your life,” explained Dr. Burgess. “It serves as an early warning system that could give you precious minutes to react during an emergency.”

When a bottle of water is placed on the floor near your bed, it can alert you to several potential dangers before official alarms sound.

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If you notice ripples in your water bottle when the sea appears calm, it could indicate unusual vibrations or tilting of the ship. These subtle movements might be imperceptible to passengers but could signal mechanical problems or navigation issues.

“The water in your bottle will react to ship movements that you might not consciously register, especially when you're sleeping,” says Dr. Burgess. “If you wake up and see the water sloshing unusually, it might be worth investigating further or alerting crew members.”

Smoke rises, but it can also seep under doors before reaching ceiling-mounted smoke detectors. A water bottle placed near the floor can show condensation changes if smoke is entering your cabin.

“In a fire scenario, the temperature and humidity near the floor change rapidly,” Dr. Burgess explains. “Condensation forming on the outside of a cool water bottle can be one of the earliest indicators of smoke entering your space.”

A water bottle on the floor serves as an immediate indicator if water begins to enter your cabin—whether from a plumbing issue or, in rare cases, a hull breach.

“From organising medical conferences on cruise ships, I've learnt that safety often comes down to simple, proactive measures. The water bottle trick is something I teach all our physician attendees. It costs nothing, takes seconds to implement, and could provide the early warning that makes all the difference in an emergency," Dr Steve continued.

“What makes this tip so valuable is that it works while you sleep. Most emergencies at sea happen overnight when passengers are least alert and most vulnerable. Having this passive monitoring system in place gives you peace of mind and potentially crucial extra minutes to respond appropriately.

“Ship safety systems are excellent, but they're designed to detect problems once they've reached a certain threshold. Your personal water bottle can alert you to subtle changes before the situation becomes severe enough to trigger alarms.

“While cruise ships today are incredibly safe, and serious incidents are rare, being prepared is something we emphasise in medicine—and it applies equally to travel. This simple habit has become second nature for experienced cruisers, but it's almost never mentioned in the safety briefings.”