The "dive" knife in the original post is a kiridashi. Non traditionally made and not worth much.
None of them appear to be worth much, but for better valuation, you should remove the tangs so if any signature exists it can be evaluated.
Even if there is no signature, the tang can still prove a lot of information, if you know what to look for.
Excluding the very first one, "dive" knife from here on out:
The others with the exception of the second one are Hira-zukuri (named for blade shape), the other one is Kanmuriotoshi-zukuri.
First one is in shirasaya (Resting scabbard) with suguba hamon.
Second (kanmuriotoshi) with gunome hamon and is in what looks to be a very late, probably meji or later tourist koshirae.
Third is in a lacquered shirasaya, looks like a letter opener or a prop for Chanoyu.
Fourth looks to be a Kwaiken in Aikuchi koshirae with no evidence of a hamon.