Hey there, I just wanted to say I completely agree with Septimaeus because I have a watch with the same style of bracelet (for any watch people reading this, It's the Casio AE-1200 or the Casio Royale in Stainless Steel). The secret is to get some sort of tool in there and use some force. As you can see from the side, there is a sort of bracket inside each end link that holds the middle links and the entire bracelet together. It's quite an interesting system. If you want to look it up online, I believe these are known as folded link bracelets.