新西兰英语 377 South Korean fishing boat sinks

　　A fishing boat with 42 men on board sank in cold Antarctic¹ waters early this morning. Only 20 men were rescued, by another South Korean fishing boat. Five bodies were recovered. Another 17 men are missing².
The boat was fishing for toothfish. This is a popular fish which lives in Antarctic waters. It usually weighs about 10kg but older toothfish can get a lot bigger.
The boat sank about 6.30am this morning but there was no SOS signal. It is possible it hit an iceberg³. Two New Zealand fishing boats helped to search at first and three South Korean boats are continuing the search. However anybody in this cold water would not survive more than 10 minutes. The water temperature is about 2 degrees Celsius⁴. New Zealand Search and Rescue did not send an Air Force plane because it would take about 8 hours to reach the area where the boat sank. This is about 2,500km south of New Zealand.
The crew of this fishing boat come from South Korea, China, Vietnam, The Philippines, Indonesia and Russia.
This is the second South Korean fishing boat to sink in the last few months. Listen to Aug 18th 2010.
Questions
There have been problems with over-fishing of toothfish (catching too many). How can countries stop this?
Why was the crew come from so many different countries?

1 Antarctic   

adj.南极(区)的；n.(the A-)南极洲，南极圈

参考例句：

• The Antarctic is a mountainous area.南极洲是一个多山的地区。
• It is well known that penguins live in the Antarctic.企鹅生活在南极洲是众所周知的。

2 missing   

adj.遗失的，缺少的，失踪的

参考例句：

• Check the tools and see if anything is missing.检点一下工具，看有无丢失。
• All the others are here;he's the only one missing.别人都来了，就短他一个。

3 iceberg   

n.冰山，流冰，冷冰冰的人

参考例句：

• The ship hit an iceberg and went under.船撞上一座冰山而沉没了。
• The glacier calved a large iceberg.冰河崩解而形成一个大冰山。

4 Celsius   

adj.摄氏温度计的，摄氏的

参考例句：

• The temperature tonight will fall to seven degrees Celsius.今晚气温将下降到七摄氏度。
• The maximum temperature in July may be 36 degrees Celsius.七月份最高温度可能达到36摄氏度。