Spanish police have released footage of the desperate attempts to reach the shore to show what they are up against.
They foiled 500 attempts last month alone as migrants are the ports of Ceuta and Melilla become crowded with migrants trying to stow away in cargo ships and passenger ferries, trying desperately to seek into the EU.
Last month, officers launched a huge operation the Brigade of Response to Clandestine Immigration (BRIC) to find the migrants, mostly young men, who are taking risky routes into Europe.
The footage has been released just weeks after it emerged more than 10,000 migrants have gone missing since arriving in Austria.
Migrants in desperate attempts to reach Europe
Migrants hide under ropes and cargo to try and reach Spain
Stowaways have hidden in trucks and close to engines
Many of them were discovered by the agents hidden in the low or exterior voids of the trucks trucks ready to embark
A statement said: “(attempts) Mostly carried out by minors who tried to reach the Spanish coast as stowaways, using various methods to access the boats, some of them especially risky for their own life.
“Many of them were discovered by the agents hidden in the low or exterior voids of the trucks trucks ready to embark.
“Others were hidden between the scrap or other goods that are stored waiting to be loaded, a particularly dangerous procedure because when they do not know the precise moment in which the material will be loaded, they can remain even several days trapped between it.”
Staff have reported being confronted by the young men who have “pushed and threatened” them after running onto the ship.
Migrants Rescued in the Mediterranean
Tue, January 3, 2017
Spanish NGO Proactiva Open Arms rescue all 112 on aboard, including two pregnant women and five children, as it drifts out of control in the central Mediterranean Sea, some 36 nautical miles off the Libyan coast January 2, 2017
1 of 12
Migrants try to reach a rescue craft from their overcrowded raft, as lifeguards from the Spanish NGO Proactiva Open Arms rescue all 112 on aboard
Fox TV presenter outraged over fund for illegal immigrants
German migrants attacked by far-right extremists won't be deported
Corbyn says lets not blame migrants for our problems
The ships the young stowaways were found on sail mainly to Malaga, Almeria or Motril.
Videos of the youngsters hanging off morning lines were released by officers said others get themselves in far more dangerous situations.
According to police some swan into marinas when the boats were docked, and tried to get in from the water.
Men spotted sliding along ropes to reach Spanish shores
More than a million people have now reached Europe through irregular means in 2015
The overall figure is a four-fold increase from 2014’s figures, and has largely been driven by Syrians fleeing their country’s civil war.