Gold in India is worth significantly more than it is in either Singapore or Dubai meaning it is an attractive commodity for smugglers.
One customs agent said: "A smuggler bringing gold pieces concealed in his rectum is often an expert. That's because not anyone can move with ease when gold pieces are in the rear."
A gold smuggler, not involved in this week's operation, known only as Sajilal, told the Daily Express, the maximum any smuggler should attempt to carry internally is 800g.
He said: 'We practice carrying the gold and try walking and sitting normally to avoid customs officials.
"Food or water is strict no during assignments. There are a few exercises we do that make work easier and help us carry more gold.
"The maximum one can carry in the rear is up to 800 grams broken into pieces."