Why don't Submarines use Radio or GPS?
15:10
Let's Measure the Speed of Light
17:07
Project E.L.F. - The history of communicating with submarines underwater - #HamRadioQA
27:18
Optical Interferometry Part 1: Introduction & ZYGO GPI layout
26:42
How Sonar Works (Submarine Shadow Zone) - Smarter Every Day 249
25:52
A Magnetic Amp and Core Memory
21:32
Why doesn't a 75 Ohm cable measure 75 Ohms?
19:28
Submarine Secrets: Pump Jets And Propellers Explained
10:19