Interesting Facts About Cruises: 20+ Facts You May Not Know

Cruise holidays are one of the most popular ways to travel, offering dining, entertainment and the chance to visit multiple destinations in one trip. Behind the pools, restaurants and ocean views is a world of engineering, technology and history.

Whether you're planning your first cruise or have sailed before, these interesting facts about cruises explain how modern cruise ships operate and what makes them unique.

At Rory's Travel Club, we help members find great value on cruise holidays to destinations around the world. We created this guide to share some interesting facts about cruises, answer common questions and help you learn more about life onboard before you set sail.

1. Cruise Ship History Goes Back More Than 180 Years

Modern cruising began in the early 19th century. Ships were originally built to transport passengers across oceans, but companies soon recognised that people would also travel for leisure.

The first recognised leisure cruise took place in 1844 which offered passengers the chance to sail from England to Gibraltar, Malta, and Athens. By the early 1900s, ocean liners had turned sea travel into an experience rather than simply a way to reach another destination.

Today, millions of people take cruises each year, and new ships continue to expand the industry's reach.

2. How Cruise Ships Work

One of the most interesting things you didn't know about cruises is how much happens behind the scenes.

Cruise ships operate like floating cities. They generate electricity, produce fresh water, manage waste, store food, provide internet access and keep thousands of people comfortable while travelling across the ocean.

Navigation systems, GPS and onboard computers help officers plan routes and monitor conditions throughout the voyage.

3. Cruise Ship Engineering Keeps Ships Afloat

Many people wonder how such large ships stay afloat.

The answer lies in cruise ship engineering. Ships are built with large hollow hulls that displace enough water to support their weight. This follows Archimedes' Principle, which states that an object floats when it displaces a weight of water equal to its own weight.

Weight is carefully distributed throughout the ship to maintain balance and stability.

4. The Largest Cruise Ships in the World Are Enormous

The largest cruise ships in the world are among the biggest passenger vessels ever built.

Some are more than 360 metres long, measure over 250,000 gross tonnes and can carry close to 10,000 people, including passengers and crew.

Many include:

• Water parks
• Ice skating rinks
• Surf simulators
• Theatres
• Shopping areas
• Zip lines
• Gardens with thousands of plants

Walking from one end of the ship to the other can take more than 20 minutes. The current largest cruise ships in the world is the Icon of the Seas and Star of the Seas, which are Royal Caribbean cruise ships. 

5. Cruise Ship Technology Improves the Passenger Experience

Modern cruise ship technology supports both passengers and crew.

Many ships now offer:

• Facial recognition for boarding
• Digital room keys
• Satellite internet
• Contactless payments
• Smart maintenance systems
• Advanced weather routing

These systems improve efficiency, safety and convenience.

6. Cruise Ship Innovations Support Sustainability

Many recent cruise ship innovations focus on reducing environmental impact.

Examples include:

• Liquefied natural gas (LNG) engines
• Wastewater treatment systems
• Shore power connections
• LED lighting
• Air lubrication systems
• Heat recovery technology
• Improved recycling programmes

These technologies help reduce emissions and improve energy efficiency.

7. Cruise Ship Statistics Show the Scale of the Industry

Some useful cruise ship statistics include:

• Large ships can carry more than 6,000 passengers.
• Crew numbers often exceed 2,000.
• Thousands of meals are prepared every day.
• Some ships have more than 20 restaurants and cafés.
• Many ships include over 2,500 cabins.
• A single cruise ship may travel tens of thousands of nautical miles each year.

These figures show the planning required to operate a modern cruise ship.

8. Cruise Ships Produce Fresh Water

One of the more surprising cruise facts is that ships can make their own drinking water.

Most modern cruise ships use desalination and reverse osmosis systems to convert seawater into fresh water.

This allows ships to spend longer periods at sea without relying on port supplies.

9. Cruise Ships Generate Their Own Electricity

Cruise ships operate their own power systems.

Electricity generated onboard powers:

• Lighting
• Air conditioning
• Kitchens
  
• Elevators
  
• Entertainment venues
  
• Navigation systems
  
• Water treatment systems
  
• Guest cabins

Without continuous power generation, the ship could not function.

10. Thousands of Crew Members Work Behind the Scenes

Cruise ships operate around the clock.

Crew members include:

• Navigation officers
  
• Engineers
  
• Hotel staff
  
• Chefs
  
• Entertainers
  
• Doctors and nurses
  
• Housekeeping teams
  
• Security staff
  
• IT specialists
  
• Maintenance crews

Each department helps keep the ship running throughout the voyage.

11. Cruise Ships Visit Destinations Around the World

Cruise itineraries cover every continent.

Popular destinations include:

• The Caribbean
  
• The Mediterranean
  
• The Norwegian Fjords
  
• Alaska
  
• Northern Europe
  
• Asia
  
• Australia
  
• South America
  
• Antarctica

Some world cruises last more than 100 days.

12. Cruise Ship Records Continue to Grow

The industry continues to set new cruise ship records.

These include:

• Largest cruise ship (Icon of the Seas - Royal Caribbean)
• Longest water slide at sea (Navigator of the Seas - Royal Caribbean)
  
• Highest observation deck (Royal Caribbean's Quantum Class Ships)
  
• Largest theatre at sea (MSC Divina)
  
• Biggest water park onboard (Icon of the Seas - Royal Caribbean)
  
• Most restaurants on a single ship (Icon of the Seas - Royal Caribbean)

Each new generation of ships introduces larger facilities and updated features, with Icon of the Seas clearly coming out on top for record holding.

13. Cruise Myths Explained

Many common cruise myths are based on outdated information.

Myth: Cruise ships rock constantly.

Reality: Modern stabilisers reduce movement in most sea conditions.

Myth: Cruises are only for older travellers.

Reality: Cruise lines cater for families, couples, solo travellers and groups of all ages.

Myth: There isn't much to do onboard.

Reality: Most ships offer entertainment, sports, dining, children's clubs and organised activities throughout the day.

14. Cruise Ships Operate Like Small Towns

One of the things you didn't know about cruises is how many facilities are available onboard.

Many ships include:

• Medical centres
  
• Shops
  
• Libraries
  
• Casinos
  
• Fitness centres
  
• Hair salons
  
• Spas
  
• Swimming pools
  
• Theatres
  
• Sports courts
  
• Children's clubs

Many passengers spend an entire sea day onboard without running out of things to do.

15. Cruise Ships Receive Regular Maintenance

Cruise ships spend much of the year at sea, but they also undergo scheduled maintenance.

During dry dock periods, engineers:

• Inspect the hull
  
• Upgrade technology
  
• Replace equipment
  
• Refurbish cabins
  
• Renovate public areas
  
• Complete safety inspections

Regular maintenance helps extend the ship's service life.

16. Cruise Ships Have Apps

Most major cruise lines now have mobile apps that passengers can use before and during their cruise. These apps have become a central part of the onboard experience.

Common features include:

• Online check-in before sailing
• Digital boarding passes
• Daily activity schedules
• Interactive ship maps
• Restaurant reservations
• Spa and entertainment bookings
• Viewing onboard accounts and spending
• Messaging other passengers (sometimes for a small fee)
• Deck plans and navigation
• Safety information and muster drill instructions
• Real-time notifications about events and itinerary changes

Excursions

Shore excursions are also managed through these apps on many cruise lines.

Passengers can typically:

• Browse available excursions before departure
• Read descriptions and activity levels
• View prices and availability
• Book or cancel excursions (subject to the cruise line's policies)
• See meeting times and locations
• Access digital tickets or booking confirmations

Popular excursion categories include:

• Guided city tours
• Wildlife experiences
• Snorkelling and diving
• Beach days
• Food and wine tours
• Adventure activities, such as zip-lining or ATV rides
• Cultural and historical tours

Some cruise lines also recommend excursions based on your itinerary or previous bookings. Most cruise lines open excursion bookings several weeks or months before departure. Booking early is often recommended because popular tours can sell out, particularly at busy ports or during peak travel seasons.

Frequently Asked Questions

Here are some FAQs to demystify cruises for you a bit more.

What are some interesting facts about cruises?

Cruise ships generate their own electricity, produce fresh drinking water from seawater and carry thousands of passengers and crew. Many operate like floating towns with restaurants, theatres, shops, medical centres and entertainment venues.

How do cruise ships stay afloat?

Cruise ships stay afloat because their hulls displace enough water to support the ship's weight. This principle, known as buoyancy, allows large steel ships to float safely.

How much fuel does a cruise ship use?

Fuel consumption depends on the size of the ship, its speed and the itinerary. Large cruise ships can use more than 100 tonnes of fuel each day while at sea. Newer ships are designed to improve fuel efficiency and reduce emissions.

How many crew members work on a cruise ship?

Large cruise ships often employ between 1,000 and 2,500 crew members, including engineers, hospitality staff, chefs, entertainers, medical professionals and navigation officers.

How are cruise ships supplied?

Ships are supplied while in port. Food, drinks, fuel, spare parts and other essential items are loaded before the next stage of the voyage.

Do cruise ships have hospitals?

Most cruise ships have medical centres staffed by doctors and nurses who can provide treatment for common illnesses, injuries and medical emergencies.

How long do cruise ships last?

A cruise ship can remain in service for 30 years or longer with regular maintenance, inspections and refurbishment.

Where does cruise ship waste go?

Modern cruise ships use wastewater treatment systems to process sewage and greywater. Solid waste is sorted, recycled where possible and disposed of in line with international and local regulations.

How are cruise ships powered?

Most cruise ships use diesel-electric or liquefied natural gas (LNG) engines. These systems generate the electricity needed for propulsion and all onboard services.

Final Thoughts

Cruise ships combine engineering, technology and hospitality on a large scale. From producing fresh water and electricity to transporting thousands of passengers across the world, they are designed to operate independently for extended periods at sea.

If you're interested in interesting facts about cruises, understanding how these ships work can give you a new appreciation for life onboard. 

If you're thinking about booking a cruise that matches your budget and style, Rory's Travel Club sends regular cruise offers from our Trusted Travel Partners on our Regular and Group Trip emails. Check out our memberships on our website!