Monday, April 29, 2019

Divers in romance (part 2) starting an instructor course 潛水員的浪漫(二)上了潛水教練課

After we were certified as beginner divers, we enrolled in an advanced course. For beginner divers, they are limited to maximum depth 18 meters. When they have advanced level, the limit is 40 meters and they may have night dive. 

For diving safety, every diver must have buddy. As Camilla and I were single, the instructor paired us to be the buddies. Sometimes, we needed to hold our hands under water to prevent missing, because the visibility was very low that is quite common in Hong Kong.
I learnt later that this is a merit for training, because you will not scare easily when you dive in a good visibility environment later.

An advanced diving course is a combination of several individuals diving techniques, such as night dive, deep dive, navigation, search and recovery, using diving computer and light salvage.

As there are not too many dive sites that are convenient for deep dive training in Hong Kong, we just practiced at 18 meters, which just met the requirements of the course's standard. The deepest sea in Hong Kong's region is a valley by the Beaufort Island, whose depth is 70+ meters.
Beaufort Island
 Most of the dive sites are much less than this. It is very dark at 18 meters in Hong Kong, because they are usually muddy bottom under such depth. The main purpose of deep dive training is to test whether you may experience nitrogen narcosis, which is tested by doing calculation at the bottom. At this depth, we may experience a lower water temperature, a greater water pressure, a longer descent and ascent time and looking absorption of sun light.
Absorption of sun light under various depth

Causes of nitrogen narcosis
Underwater, all nitrogen is not expelled during exhalation; when pressure increases, the nitrogen is forced from the lungs into the blood, and from the blood into the tissues, including the brain.  Nitrogen narcosis mimics alcohol intoxication. And just as with alcohol, different divers have different degrees of susceptibility to nitrogen's effects and may experience varying intensities of narcosis from one day to the next. The exact mechanics of the syndrome are not well understood. One theory is that the nitrogen blocks neurotransmitters and receptors in the brain, resulting in a distortion of electrochemical signals.
The level of the disability varies, depending on the physical and emotional state of the diver that day, the water temperature, and the extent of disorientation that can occur with ever-changing underwater visibility. The sense of time itself can grow distorted, and the diver may feel euphoric. Sometimes, a diver may feel sad, but he may also feel paranoia. Unlike an alcohol buzz, which lasts for a while even after the person stops drinking, nitrogen narcosis is thought to leave no comparable negative residual effect, and all the divers who are unduly affected have to do is ascend to a shallower depth, and their wits will return immediately. 

After we were certified as an advanced diver, we celebrated at a Sai Kung's restaurant. Camilla asked me whether I may be her buddy, because she needed more practices to gain confidence and she has been feeling she was comfortable to dive with me as I have shown I am good in the performance of diving techniques and care of her. I replied her: "Sure, why not? It is my pleasure to have your trust."

I lived in Hong Kong Island where is quite far from Sai Kung to where I had to take more than one hour public transport. She offered she may pick me up in the morning because she also lives in Hong Kong Island. It was ever the first time that I had a chance to ride by Maserati.

After we have made several fun dives, the course director who was the owner of the dive shop, Hong Kong Institute of Scuba Training, persuaded us to have further education of diving. 

What is the progress of learning diving?
Flow chart of Scuba diving courses
In simple, the next step is master diver and then rescue diver, which is the highest level of non-leadership level. The next is dive master, instructor, instructor trainer and course director, which are leadership level.

As I wanted to have an excuse to dive with her, I have desired to take these courses. I asked her: "Do you have interest to become an instructor?" She replied: "If you took instructor course, I would join also." I thought we would have many chances to meet and dive together.

Saturday, April 06, 2019

Divers in romance (part I) We met in a class 潛水員的浪漫(一)認識了一個學潛水的少女

Now, I will write a series of stories that will be narrated my history about diving activities.
Stay tuned. This is a long story.

I have been a scuba diving instructor for twenty years. Why have I become an instructor? I had not desired as an instructor before, but it has brought me a lot of memory. It was all about a trip to a paradise island, to where I was given a free ticket. On a local trip, the guide made me share a boat with a couple of divers who dove at the middle of the boat trip, then I was waiting on the boat for an hour. I thought diving is quite cool.

After I have returned to home, I enrolled in a beginner diving course, which is the most basic course for learning scuba diving.
HKIST diving course schedule
In this class, it had 4 students who were a couple, a single girl and me. As I am good at swimming, I did very well to pickup all techniques. During the course, we had many things to learn. We had eight hours lecture of diving theory, two sections pool training for six hours and two and half days boat dive in open water for practice

After each day's training, the instructor and we had a tea to review our training and shared something of ourselves as well.  

The couple were civil servants so they had too many holidays, which they spent. This was the reason why they learnt scuba diving.
The girl was only 24 years old and she has been a freelance private English tutor since she graduated. Her name is Camilla and she studied linguistics in USA so that she can speak English and several European's languages very well.  When any natives speak with her on phone, no one may realize that they are talking with an Asian. She may speak in both common accents, which are received or posh and general American pronunciation. Although they have only slightly differences in some vowel and consonant pronunciations, she speaks both perfectly. She raised some differences such as the letter 'O' pronounces /ɒ/ for British and /aː/ for American.
Therefor, she may mock an American or a British. When we have become a friend later, she taught me from the basic, core concept of English, then I found that my previous English classes were useless and waste of time. Had I had an English teacher who has just half of her techniques and knowledge, I would not have failed in English paper in Advanced level Examination.

She told us why she has learnt scuba diving. She just broke up from a six year relationship which was her first dating. Her ex-boy friend was a sporty guy and they had been dating since she studied in high school.  Her breaking up made her food for thought. She wanted to try something that she had never done before. I guessed her ex-boy friend was a diver. Although she was enjoying scuba diving, she has still been caring her beauty. She always covers all her skin, when she is on surface and keeps away from sun light.

I didn't know as a freelance English teacher can have such high income.
She drove Maserati and bought full set of diving gears that were the most advanced models while we were using rental gears. I known later that she is the daughter of the chairman of  a Hong Kong listing company, but she has never disclosed to acquaintances.

Tuesday, April 02, 2019

How do fish fall in love? 魚如何表達愛意?

As humans, we may hold her hands, hug, kiss
or make love. In common, they are physical intimacy gestures. Fish, they can only use their gill to touch each other.