I just came across The Temple of Poseidon, by Paul Reiche III, published on Dragon #46.
I think this is an adventure with a feel that is quite Blackmoorian (yes, you need to replace Poseidon with some other deity, but this is really minor reskinning...), of the lovecraftian kind of Blackmoor flavour that involves fish-men and ancient evil.
Did you encounter this adventure before? what do you think?

Hmmmmm I think I'll need to go through my old Dragon mags & see if I have that issue, then I'll get back to you on that.

Wasn't there a statue of Poseidon in the original Blackmoor dungeon?

-Havard

Yes, I think it's on the third level. We encountered it on our first dungeon adventure...