All of those wrecks can have very strong current. You must traverse a fixed mooring line. These dives can be a bit challenging. This due to depth, the sheer size of the wrecks and the current and the potential to accidentally get too deep or too far from your mooring line for a safe return (and have to use another mooring ball).
Me (selfie) with my Phoenix Royal Aquamaster on the Spiegel:

Same trip I think, the Vandie:


Me (selfie) with my Phoenix Royal Aquamaster on the Spiegel:

Same trip I think, the Vandie:

