In an Uncle Scrooge (or Scrooge McDuck, not sure of the translation here) comic named "Treasure Under Glass", Scrooge orders a giant glass dome to be manufactured in order to aid his endeavours exploring a 17th shipwreck containing a valuable treasure.
The giant dome, which is Donald's idea is described in the following image by a fine engineering drawing
since I couldn't find a pdf of the comic :
The primary objective is to clear the area of sharks so it can be explored on foot.
From the comic, I made the following rough estimates :
- The spanish galeon is 60m long (based on the Neptune), which would make the dome bottom diameter approximately equal to 100 m
- We will assume the dome is a perfect half-sphere (assuming from the drawings in the comic)
- Dome height estimated at 50 m according to the previous statement
- The dome is tightened to the bottom of the ocean with several ropes as in the drawing, each rope being fixed into the wet sand at its end. According to the comic, we see that there are 5 ropes extending from one side to another, distributed in an even fashion.
- Following 3., the estimated depth at the bottom of the wreck is 100 m
Following these assumptions, would such a thing be feasible from an engineering point of view, assuming close to infinite funds and that Scrooge agrees to pay the bill ?
In particular :
- What kind of tension would each rope have to withstand ? Would regular ropes be enough or should they have used steel cables ?
- How would those be tighten into the sand in a reliable way ?
- What kind of tremendous forces would the dome have to withstand ?