Turntable for boats

[steinjr]

My guess is :
1- the object at the top of the picture is a "floating drydock".
2- the object directly above the turntable, in the picture, is a "float bridge".
3- and the whole complex is an ingenious variation of a "marine Railway"
The tugs are moved into the submersed drydock, which is then pumped out, raising the tug out of the water. The raised drydock is then floated over to the bridge float, and the tug is "railed" ashore. When the maintenance is completed, the reverse process puts the tug back in the water.

That is indeed exactly how it works, as explained in the link I posted a little earlier in this thread :-)

Smile,
Stein