7 Little Killers

Today's Puzzle:

How could these cute little pirates be killers? Save them from such a fate and solve this puzzle please!

Link to Play Along:

Seven Little Killers by Florian Wortmann https://tinyurl.com/SudokuSleuth7LittleKillers

Rules:

Normal Sudoku rules apply.

A clue outside the grid is the sum of the digits along the indicated diagonal. Digits can repeat along the diagonal if allowed by the other rules.

Example: If R3C4 had an arrow pointing to the left and was a 3, and the digit below that arrow in R4C4 was a 5, then another 5 would be placed in R3C1.

Additionally the grid is partially covered in fog. Placing correct digits will clear the fog from surrounding cells, possibly revealing more clues.