On the second week we decided to make a to-do list, to make sure that nothing will be forgotten during the project.

Here is the to-do list :

Control the buoyancy of the hull ------> for that use the mathematical formulas :  
                                                                - Apparent Weight = Real Weight − Archimedean thrust
                                                                - Archimedean thrust  = ρeau × Volume × gravity
Find a scale
Weight the tube Know the variables : peau = 1000kg/m3 , Volume of everything (electronics, seringue, ...) , gravity is 9.81 Test buoyancy with a plastic bag and determine the neutral point with dense objects
 
Control the syringe, with the rails --------> for that use a worm drive, make the sketch of the rails and/or the worm drive (Search if there's any stl models online)
Test it and see if the moving part of the syringe moves or not. If not try something different.

Control the propeller  -----> use a driver to manage the tension. Find a  stl propeller. Use the 3D machine to print it.
Choose the ESP32 See the doc of the ESP32 and the driver LN298. Make the code and adapt it to control the speed of the propeller.

How to manage the elements in the tube ----> maybe a underbody or stem. Mesure the inside height of the acrylic tube
Make the sketch of a underbody with the features
Remarks : Maybe buy another acrylic tub
Make a list of everything that we need : -ESP
                                                                 -Driver
Find the equal to the Lego EV3 cable pinout for driving the syringe

For the next week we will have to buy the plexiglass tub and the syringe. But also do the CAD for the worm drive, the gears, the axle and the rails.