Tear bread into large chunks, place in a large bowl, and cover with water. Set aside until bread has softened, about 3 minutes.
Combine almonds, garlic, and salt in the bowl of a food processor fitted with a blade attachment and process until the nuts are finely ground (be careful not to turn the mixture into a paste), about 30 seconds. Squeeze out the water from the bread, add to the processor, and pulse until the bread is incorporated but not forming a ball, about 10 pulses.
Add the cucumber a