Slice the baguette in half lengthwise (don't slice all the way through, keep one of the sides intact). Toast for 2-3 minutes.
Drizzle mayonnaise on the bottom inside of the bread. Drizzle Maggi seasoning on the top inside of the bread.
Remove the sardines from the tin (no need to keep the oil). Layer the sardines on top of the mayonnaise. You can use a fork to slightly "smash" the sardines into the bread so that it doesn't slip out later.
Then add the cilantro on top of the sardines. And then the cucumbers on top of the cilantro.
Close the sandwich, and press lightly to "seal" everything in. Eat hot and enjoy! ^_^