I was just building up some redstone project and i started to hear creepy noises and i was in a flat world with always day and i got a bit scared so i searched about this on minecraft wiki and learnt that,the noises were ambience sounds which would activate when the player would be in a cave,underwater,or in the nether but instead of that,in the new beta,they were going off when they shouldnt have and for me it is quite disturbing which is why i have reported this bug