Inside a giant ship.
Peel back the steel. Explore the systems that carry the cargo, power the propellers and support life at sea.
A long cargo hull built around stacks of boxes, a slow-speed engine and a carefully planned distribution of weight.
Original schematic, not to scale or a plan of a named vessel. Scroll across the drawing on small screens. Select a numbered point or use the buttons below.
Read all six system explanations
1. Bridge & accommodation
The bridge provides the view and instruments used to navigate. Living spaces, galley and offices are grouped in the accommodation block. This example places them aft; some large container ships separate the bridge and engine casing to improve sightlines. Read more →
2. Main engine
A large low-speed diesel can drive the propeller through a shaft without reduction gearing. Fuel preparation, lubricating oil, cooling water, starting air and exhaust systems surround the engine. The complete propulsion plant is much larger than its cylinders. Read more →
3. Cargo holds & hatch covers
Containers below deck sit in holds. Cell guides locate boxes and hatch covers separate those holds from deck stacks. A stowage plan accounts for weight, discharge sequence, dangerous goods and lashing loads. A nominal TEU capacity is not the weight aboard. Read more →
4. Deck stacks
Deck containers add cargo capacity above the hull. Twistlocks and lashing arrangements restrain them, while the loading plan controls stack weights and visibility. A high stack moves weight upwards and presents a large surface to the wind. Read more →
5. Double bottom & ballast
Tanks low in the hull help adjust draft, trim and loading condition. The double bottom also creates structural depth beneath the cargo spaces. Ballast is managed as part of the complete loading plan, not simply added whenever the vessel rolls. Read more →
6. Propeller & rudder
The propeller accelerates water to create thrust. A conventional rudder turns that flow into a side force, which creates a yawing moment on the hull. Response depends on water flow, loading, speed and depth. Astern thrust takes time to arrest forward momentum. Read more →
A passenger ship is also a power station, hotel and water-treatment plant. Machinery and service routes sit beneath the public decks.
Original schematic, not to scale or a plan of a named vessel. Scroll across the drawing on small screens. Select a numbered point or use the buttons below.
Read all six system explanations
1. Navigation bridge
The bridge coordinates navigation, lookout, communication and ship handling. Propulsion controls here send commands to machinery elsewhere in the vessel. Pilots and tug crews work with the bridge team during port movements. Read more →
2. Cabins & public decks
Passenger accommodation occupies much of the superstructure. Escape routes, fire boundaries, ventilation and service access are designed alongside the visible restaurants and cabins. Gross tonnage describes enclosed volume, which is especially useful for comparing these ships. Read more →
3. Galleys & hotel services
Cold rooms, food preparation, laundry, freshwater production and waste systems support the people aboard. Their electrical and cooling demands continue when the ship is stationary. These hotel loads compete with propulsion for generating capacity. Read more →
4. Generators & switchboards
In a diesel-electric arrangement, generator sets feed an electrical network. That network powers propulsion motors and ship services. Multiple generating sets offer flexibility, but segregation and recovery procedures matter as much as the number of engines. Read more →
5. Stabilizer fins
Controlled fins create a rolling moment that opposes wave-induced motion. Their location, size and operating envelope are vessel-specific. Some systems work at rest by moving their fins actively; not every fin installation has that capability. Read more →
6. Electric propulsion pods
This schematic uses steerable electric pods. Motors drive the propellers, and rotating the units changes thrust direction. Other passenger ships use shafts or combinations of fixed and steerable units. This drawing is not the machinery plan of Queen Mary 2. Read more →
A tanker separates cargo spaces, ballast and machinery. Its purpose is transporting liquid safely across a wide range of loading conditions.
Original schematic, not to scale or a plan of a named vessel. Scroll across the drawing on small screens. Select a numbered point or use the buttons below.
Read all six system explanations
1. Bridge & accommodation
Aft accommodation keeps living and control spaces grouped away from much of the cargo deck. Ventilation, hazardous-area boundaries and access arrangements depend on the ship design. This generalized view does not specify a particular tanker’s fire divisions. Read more →
2. Cargo tanks
Longitudinal and transverse bulkheads divide the liquid cargo into tanks. Operators monitor levels, temperatures and cargo compatibility. Partly filled tanks create free-surface effects; tank subdivision helps control them but does not remove the need for a loading calculation. Read more →
3. Cargo deck & manifolds
Cargo pipes connect tanks to the shore interface. The manifold is where terminal hoses or loading arms connect. Pumps, valves, venting arrangements and shutdown communication work together during a transfer. These pipes are distinct from a ballast-treatment circuit. Read more →
4. Segregated ballast spaces
Modern tankers commonly carry ballast in spaces separated from the cargo, including double-bottom and side tanks. This drawing shows a modern double-hull arrangement. It must not be read as an original construction drawing for historic Seawise Giant. Read more →
5. Machinery space
The machinery plant supplies propulsion and the services the ship needs at sea and in port. Modern tankers often use diesel propulsion; historic ultra-large tankers such as Seawise Giant could use steam turbines. Fuel type and propulsion arrangement are separate questions. Read more →
6. Propeller & steering
A laden tanker has substantial inertia. A large rudder and powerful machinery do not create an instant stop or turn. Passage planning, pilotage, under-keel clearance and tug assistance are part of handling the vessel, particularly as speed falls. Read more →
Go below the surface
These drawings introduce the arrangements discussed in our sourced guides to propulsion, hull structure, ballast and cruise-ship construction.