Board Thread:Questions and Answers/@comment-37587452-20181202221521/@comment-10429980-20181215171107

The kraken profile does mention they can stretch their tentacles, so combined with their supernatural level of strength they could anchor themselves to the sea bed on one end, wrap their tentacles around the ship on the other hand, and pull in a manner not unlike a typical Superman feat.

I do admit that being able to grow in size could look better, but as far as we know they don't do that.

As for KC's lamia, they would certainly be very heavy. However, I don't think any of the ones he has depicted would have their snake portion even reach 20 feet, let alone approach 30 feet. Not sure how to prove it, but just looking at them their snake portion seems to only be about 4 or 5 times the length of their human portion. Assuming said human portion is around three feet tall (which would still be larger in size than an average human woman, as I'm 5 foot 9 and my upper body is around 3 feet tall), that would put their snake portion at around 15 feet at most. I'm sure there's a way to get more accurate measurements, but KC's lamia not holding their bodies in straight lines means its tougher (which incidentally is why its hard to measure the length of real snakes as well).

Assuming this is true then their lengths are actually shorter than a number of real world living snakes, though of course lamias would be proportionally much heavier thanks to their thicker bodies.