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Long-distance inspection ROV

Hi everyone!

I have a situation. We want to make an ROV with a 5 km tether. We have a tunnel inspection project.

According to our research, ROVs which are capable of doing this kind of mission have bigger thrusters such as Saab Seaeye Falcon thruster with 50 kgf total thrust and 14 mm cable. Can we use T200 on the ROV for this project with this long tether?

We thought if we increase the number of thrusters such as 12, we can manage the tether. What do you suggest about this and design of thrusters? Do we have to use bigger thrusters?

We want to use same electronic system with BlueROV2. We will use multi-battery system.

There are troubles about energy source of ROV. Can we run this ROV with battery or must we send the energy from land with tether? We want to use single mode fiber optic tether. Can we get all information from ROV with single mode fiber optic, such as sonars, usbl, camera, commands.

Thanks a lot!

If you check this link out

The guys at seaview did a long 2.4 km inspection
They also have a battery manager which allows the use of multiple battery’s.
If you go down the road of topside power. You will have to step the voltage up a lot for that length of tether or use bigger conductors which then leads to a larger tether and more drag. So more thruster Force is needed and so on.
Everything you have listed will work over fiber optics with the exception of the USBL which won’t work in a tunnel at that length anyway as there’s too much reflection from the tunnel.
I would say you would be better off with a cable counter on your tether so you know exactly how far down the tunnel you are.