These pictures shows the incredible lengths immigrants go to in order to enter Spain across its land border with Morocco.

Tying themselves underneath car bumpers and squashed beneath seats or even in petrol tanks, they are often pulled from the vehicle struggling to breathe or suffering from petrol inhalation.

Police officers in Spain's north African enclave of Melilla recently pulled off a car bumper to discover a 29-year-old from Guinea underneath held in place with ropes.

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This migrant from Guinea was found attempting to cross into Spain while tied underneath a car bumper

Another man caught by Spanish police was found underneath a car seat cover while holding a flat board

This boy from Africa tried to enter the enclave of Melilla curled up inside a travel suitcase

And another man was carefully hidden under the dashboard of a vehicle as it crossed into the small Spanish-run territory on Morocco's coast

They pulled apart the Moroccan-registered Renault Clio after detecting a heartbeat on a hi-tech sensor.

The African man, who was barefoot and had large holes in his socks, was rushed to hospital after officers saw he was having difficulty breathing.

Guardia Civil spokesman Francisco Perez said: 'He was in a very serious way when we found him. 'Our priority was to make sure he got proper medical attention because he was having problems breathing and suffering numbness in several parts of his body.'

Two Moroccans inside the car, a 46-year-old and a 24-year-old were arrested and questioned before being handed over to a judge expected to remand them in prison.

The unnamed immigrant was today released from hospital after treatment and taken to a local holding centre.

Hours earlier two Guineans, a 24-year-old and a 13-year-old, were found squashed into a specially-adapted hidden space under the passenger seat of a Mercedes trying to cross the same border.

The Moroccan driver fled the scene as police started a minute search of the vehicle but was stopped after a chase and arrested.

The younger of the two Guineans was placed in the care of local social services.

Other images taken by authorities at the border show a young boy crammed into a suitcase and a man hidden underneath a car's dashboard.

In one particularly shocking instance, a man had to be cut from inside a car's fuel tank and rushed to hospital when it was realised he had been inhaling toxic petrol fumes.

Another hiding spot favoured by migrants is squashing inside the footwell of the car's passenger seat

The knees of a migrant attempting to enter Spanish territory can be seen squashed underneath this vehicle

Many of those who try such hiding places require hospitalisation when found due to the breathing difficulties caused by breathing in such tight spaces