NoD limit for 18m (or 60ft) is 60 minutes. Anything past 60 minutes you will owe decompression. Thats if you have enough air to be at that depth for that long.
18 metres/60 feet
Recreational divers usually don't go any deeper than 60ft. The recreational dive limit is 130ft.
6 metres according to channel 4!
According to the internet, 9 sq yards is equal to 7.52515 sq metres.
101 x 67 metres according to SKY
The minimum height should be 3 metres (10 feet), but for top International matches and tournaments it must be a minimum of 5 metres (16 feet 6 inches). If you're playing just for fun, at home or anywhere else, it can be whatever you have available.
5.8 metres according to the Floating Dhow Restaurant GPS
According to data in Wikipedia... 886 feet (270 metres).
indoor volleyball is 29' 6" x 59" beach volleyball is 30'x60'
According to the internet, Mount Everest is 8,848 metres Therefore, dividing the height by 8 gives: 8848÷8 = 1106 metres
According to Wikipedia, the Eiffel Tower measures 896 feet (273 metres) from street level to the top floor, 986 feet (300.65 metres) to the roof and 1063 feet (324 metres) to the top of the antenna spire.
the 'grande arche' is roughly a cube. It has a length of 112 metres, a width of 107 metres and is 110 metres tall. According to Wikipedia, Notre Dame de Paris could fit into the empty space in the middle.