In pictures: Visby corvette

1 of 7 The Visby, seen here during trials in the Baltic, has a top speed of 35 knots

2 of 7 The Visby is designed to accommodate a helicopter

3 of 7 The Visby, seen here in dry dock in Kockums' yard in Karlskrona, comes into service in January

4 of 7 The Visby's designers admit it looks like a "lunchbox"

5 of 7 The Visby, the pride of the Swedish Navy, will seek out enemy submarines in the Baltic

6 of 7 The Visby corvettes are built almost entirely out of carbon fibre

7 of 7 The Visby is so designed as to maintain a low "radar signature"