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Swift - address of array elements

I wrote some short IBM Swift Sandbox shortcodes and came across a confusing issue

I tried to get the addresses of the elements of the array:

func printMemory(ptr: UnsafePointer<Int>){
    print("At memory:\(ptr)")
}

var arr: [[Int]] = [
    [0,1,2,3,4],
    [0,1,2],
    [0]
]
printMemory(&arr[0][0])
printMemory(&arr[1][0])

And the output of this code has the same addresses.
Changing "UnsafePointer" to "UnsafeMutablePointer" will solve this problem, but I just don't know why this is happening.
Why do I get the same address first and what occupies this address?

Another issue I encountered:

Also, if I only changed the last two lines of code to:

printMemory(&arr[0])
printMemory(&arr[0][1])

.
, , , arr [0] [Int], Int UnsafePointer. .
, . , . "UnsafeMutablePointer" printMemory(), .
, , , .
!

+4
1

: , , , , [0,1,2,3,4] , [0,1,2] [0], .

-1

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