Testimonial: Dr. José Cortés Medical Physician and IMCA Coordinator at Diavaz, Mexico Throughout the years Tungum has been used on DSV's (Dive Support Vessels) around the world. The reason is that Tungum is safer and requires no maintenance compared to 316 stainless steel tube. Take a moment to read the testimonial by Dr. José Cortés for a firsthand account of working with Tungum. /userfiles/downloads/sys/34%20-%20Diavaz%20Testimionial.pdf